My guesstimate would be that there are more than 5 users with 15k+ reports now. Although, I think the leader of reports is quite a bit ahead of everyone else, and if they're not then I'll be impressed as the figures I was hearing are absolutely insane!
You mean this dude?
https://bitcointalk.org/index.php?topic=5147931
Yeah thats one of them and from time to time i was working with him , he is a awesome nice helping hand and a very good User !