On a MediaWiki install we have special pages (https://www.wikidata.org/wiki/Special:SpecialPages) like Most linked-to pages and Pages with the most interwikis. The wikibase extension should add an extension for items with the most sitelinks.
Rough query:
SELECT ips_item_id, COUNT(ips_item_id) FROM wb_items_per_site GROUP by ips_item_id ORDER BY COUNT(ips_item_id) DESC LIMIT 100;