/* Configuration */
var QUESTION_ID = 92410; // Obtain this from the url
// It will be like https://XYZ.stackexchange.com/questions/QUESTION_ID/... on any question page
var ANSWER_FILTER = "!t)IWYnsLAZle2tQ3KqrVveCRJfxcRLe";
var COMMENT_FILTER = "!)Q2B_A2kjfAiU78X(md6BoYk";
var OVERRIDE_USER = 48934; // This should be the user ID of the challenge author.
/* App */
var answers = [], answers_hash, answer_ids, answer_page = 1, more_answers = true, comment_page;
function answersUrl(index) {
 return "https://api.stackexchange.com/2.2/questions/" + QUESTION_ID + "/answers?page=" + index + "&pagesize=100&order=desc&sort=creation&site=codegolf&filter=" + ANSWER_FILTER;
}
function commentUrl(index, answers) {
 return "https://api.stackexchange.com/2.2/answers/" + answers.join(';') + "/comments?page=" + index + "&pagesize=100&order=desc&sort=creation&site=codegolf&filter=" + COMMENT_FILTER;
}
function getAnswers() {
 jQuery.ajax({
 url: answersUrl(answer_page++),
 method: "get",
 dataType: "jsonp",
 crossDomain: true,
 success: function (data) {
 answers.push.apply(answers, data.items);
 answers_hash = [];
 answer_ids = [];
 data.items.forEach(function(a) {
 a.comments = [];
 var id = +a.share_link.match(/\d+/);
 answer_ids.push(id);
 answers_hash[id] = a;
 });
 if (!data.has_more) more_answers = false;
 comment_page = 1;
 getComments();
 }
 });
}
function getComments() {
 jQuery.ajax({
 url: commentUrl(comment_page++, answer_ids),
 method: "get",
 dataType: "jsonp",
 crossDomain: true,
 success: function (data) {
 data.items.forEach(function(c) {
 if (c.owner.user_id === OVERRIDE_USER)
 answers_hash[c.post_id].comments.push(c);
 });
 if (data.has_more) getComments();
 else if (more_answers) getAnswers();
 else process();
 }
 }); 
}
getAnswers();
var SCORE_REG = /<h\d>\s*([^\n,]*[^\s,]),.*?(\d+)(?=[^\n\d<>]*(?:<(?:s>[^\n<>]*<\/s>|[^\n<>]+>)[^\n\d<>]*)*<\/h\d>)/;
var OVERRIDE_REG = /^Override\s*header:\s*/i;
function getAuthorName(a) {
 return a.owner.display_name;
}
function process() {
 var valid = [];
 
 answers.forEach(function(a) {
 var body = a.body;
 a.comments.forEach(function(c) {
 if(OVERRIDE_REG.test(c.body))
 body = '<h1>' + c.body.replace(OVERRIDE_REG, '') + '</h1>';
 });
 
 var match = body.match(SCORE_REG);
 if (match)
 valid.push({
 user: getAuthorName(a),
 size: +match[2],
 language: match[1],
 link: a.share_link,
 });
 
 });
 
 valid.sort(function (a, b) {
 var aB = a.size,
 bB = b.size;
 return aB - bB
 });
 var languages = {};
 var place = 1;
 var lastSize = null;
 var lastPlace = 1;
 valid.forEach(function (a) {
 if (a.size != lastSize)
 lastPlace = place;
 lastSize = a.size;
 ++place;
 
 var answer = jQuery("#answer-template").html();
 answer = answer.replace("{{PLACE}}", lastPlace + ".")
 .replace("{{NAME}}", a.user)
 .replace("{{LANGUAGE}}", a.language)
 .replace("{{SIZE}}", a.size)
 .replace("{{LINK}}", a.link);
 answer = jQuery(answer);
 jQuery("#answers").append(answer);
 var lang = a.language;
 if (/<a/.test(lang)) lang = jQuery(lang).text();
 
 languages[lang] = languages[lang] || {lang: a.language, user: a.user, size: a.size, link: a.link};
 });
 var langs = [];
 for (var lang in languages)
 if (languages.hasOwnProperty(lang))
 langs.push(languages[lang]);
 langs.sort(function (a, b) {
 if (a.lang > b.lang) return 1;
 if (a.lang < b.lang) return -1;
 return 0;
 });
 for (var i = 0; i < langs.length; ++i)
 {
 var language = jQuery("#language-template").html();
 var lang = langs[i];
 language = language.replace("{{LANGUAGE}}", lang.lang)
 .replace("{{NAME}}", lang.user)
 .replace("{{SIZE}}", lang.size)
 .replace("{{LINK}}", lang.link);
 language = jQuery(language);
 jQuery("#languages").append(language);
 }
}

body { text-align: left !important}
#answer-list {
 padding: 10px;
 width: 290px;
 float: left;
}
#language-list {
 padding: 10px;
 width: 290px;
 float: left;
}
table thead {
 font-weight: bold;
}
table td {
 padding: 5px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" href="//cdn.sstatic.net/codegolf/all.css?v=83c949450c8b">
<div id="answer-list">
 <h2>Leaderboard</h2>
 <table class="answer-list">
 <thead>
 <tr><td></td><td>Author</td><td>Language</td><td>Size</td></tr>
 </thead>
 <tbody id="answers">
 </tbody>
 </table>
</div>
<div id="language-list">
 <h2>Winners by Language</h2>
 <table class="language-list">
 <thead>
 <tr><td>Language</td><td>User</td><td>Score</td></tr>
 </thead>
 <tbody id="languages">
 </tbody>
 </table>
</div>
<table style="display: none">
 <tbody id="answer-template">
 <tr><td>{{PLACE}}</td><td>{{NAME}}</td><td>{{LANGUAGE}}</td><td>{{SIZE}}</td><td><a href="{{LINK}}">Link</a></td></tr>
 </tbody>
</table>
<table style="display: none">
 <tbody id="language-template">
 <tr><td>{{LANGUAGE}}</td><td>{{NAME}}</td><td>{{SIZE}}</td><td><a href="{{LINK}}">Link</a></td></tr>
 </tbody>
</table>

Leaderboard

Here is a Stack Snippet to generate both a regular leaderboard and an overview of winners by language.

/* Configuration */
var QUESTION_ID = 92410; // Obtain this from the url
// It will be like https://XYZ.stackexchange.com/questions/QUESTION_ID/... on any question page
var ANSWER_FILTER = "!t)IWYnsLAZle2tQ3KqrVveCRJfxcRLe";
var COMMENT_FILTER = "!)Q2B_A2kjfAiU78X(md6BoYk";
var OVERRIDE_USER = 48934; // This should be the user ID of the challenge author.
/* App */
var answers = [], answers_hash, answer_ids, answer_page = 1, more_answers = true, comment_page;
function answersUrl(index) {
 return "https://api.stackexchange.com/2.2/questions/" + QUESTION_ID + "/answers?page=" + index + "&pagesize=100&order=desc&sort=creation&site=codegolf&filter=" + ANSWER_FILTER;
}
function commentUrl(index, answers) {
 return "https://api.stackexchange.com/2.2/answers/" + answers.join(';') + "/comments?page=" + index + "&pagesize=100&order=desc&sort=creation&site=codegolf&filter=" + COMMENT_FILTER;
}
function getAnswers() {
 jQuery.ajax({
 url: answersUrl(answer_page++),
 method: "get",
 dataType: "jsonp",
 crossDomain: true,
 success: function (data) {
 answers.push.apply(answers, data.items);
 answers_hash = [];
 answer_ids = [];
 data.items.forEach(function(a) {
 a.comments = [];
 var id = +a.share_link.match(/\d+/);
 answer_ids.push(id);
 answers_hash[id] = a;
 });
 if (!data.has_more) more_answers = false;
 comment_page = 1;
 getComments();
 }
 });
}
function getComments() {
 jQuery.ajax({
 url: commentUrl(comment_page++, answer_ids),
 method: "get",
 dataType: "jsonp",
 crossDomain: true,
 success: function (data) {
 data.items.forEach(function(c) {
 if (c.owner.user_id === OVERRIDE_USER)
 answers_hash[c.post_id].comments.push(c);
 });
 if (data.has_more) getComments();
 else if (more_answers) getAnswers();
 else process();
 }
 }); 
}
getAnswers();
var SCORE_REG = /<h\d>\s*([^\n,]*[^\s,]),.*?(\d+)(?=[^\n\d<>]*(?:<(?:s>[^\n<>]*<\/s>|[^\n<>]+>)[^\n\d<>]*)*<\/h\d>)/;
var OVERRIDE_REG = /^Override\s*header:\s*/i;
function getAuthorName(a) {
 return a.owner.display_name;
}
function process() {
 var valid = [];
 
 answers.forEach(function(a) {
 var body = a.body;
 a.comments.forEach(function(c) {
 if(OVERRIDE_REG.test(c.body))
 body = '<h1>' + c.body.replace(OVERRIDE_REG, '') + '</h1>';
 });
 
 var match = body.match(SCORE_REG);
 if (match)
 valid.push({
 user: getAuthorName(a),
 size: +match[2],
 language: match[1],
 link: a.share_link,
 });
 
 });
 
 valid.sort(function (a, b) {
 var aB = a.size,
 bB = b.size;
 return aB - bB
 });
 var languages = {};
 var place = 1;
 var lastSize = null;
 var lastPlace = 1;
 valid.forEach(function (a) {
 if (a.size != lastSize)
 lastPlace = place;
 lastSize = a.size;
 ++place;
 
 var answer = jQuery("#answer-template").html();
 answer = answer.replace("{{PLACE}}", lastPlace + ".")
 .replace("{{NAME}}", a.user)
 .replace("{{LANGUAGE}}", a.language)
 .replace("{{SIZE}}", a.size)
 .replace("{{LINK}}", a.link);
 answer = jQuery(answer);
 jQuery("#answers").append(answer);
 var lang = a.language;
 if (/<a/.test(lang)) lang = jQuery(lang).text();
 
 languages[lang] = languages[lang] || {lang: a.language, user: a.user, size: a.size, link: a.link};
 });
 var langs = [];
 for (var lang in languages)
 if (languages.hasOwnProperty(lang))
 langs.push(languages[lang]);
 langs.sort(function (a, b) {
 if (a.lang > b.lang) return 1;
 if (a.lang < b.lang) return -1;
 return 0;
 });
 for (var i = 0; i < langs.length; ++i)
 {
 var language = jQuery("#language-template").html();
 var lang = langs[i];
 language = language.replace("{{LANGUAGE}}", lang.lang)
 .replace("{{NAME}}", lang.user)
 .replace("{{SIZE}}", lang.size)
 .replace("{{LINK}}", lang.link);
 language = jQuery(language);
 jQuery("#languages").append(language);
 }
}

body { text-align: left !important}
#answer-list {
 padding: 10px;
 width: 290px;
 float: left;
}
#language-list {
 padding: 10px;
 width: 290px;
 float: left;
}
table thead {
 font-weight: bold;
}
table td {
 padding: 5px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" href="//cdn.sstatic.net/codegolf/all.css?v=83c949450c8b">
<div id="answer-list">
 <h2>Leaderboard</h2>
 <table class="answer-list">
 <thead>
 <tr><td></td><td>Author</td><td>Language</td><td>Size</td></tr>
 </thead>
 <tbody id="answers">
 </tbody>
 </table>
</div>
<div id="language-list">
 <h2>Winners by Language</h2>
 <table class="language-list">
 <thead>
 <tr><td>Language</td><td>User</td><td>Score</td></tr>
 </thead>
 <tbody id="languages">
 </tbody>
 </table>
</div>
<table style="display: none">
 <tbody id="answer-template">
 <tr><td>{{PLACE}}</td><td>{{NAME}}</td><td>{{LANGUAGE}}</td><td>{{SIZE}}</td><td><a href="{{LINK}}">Link</a></td></tr>
 </tbody>
</table>
<table style="display: none">
 <tbody id="language-template">
 <tr><td>{{LANGUAGE}}</td><td>{{NAME}}</td><td>{{SIZE}}</td><td><a href="{{LINK}}">Link</a></td></tr>
 </tbody>
</table>