This only counts the last editor on non-deleted posts, so it's very incomplete.
Q&A for programmers
select top ##Limit##
rank() over (order by count(*) desc),
lasteditoruserid as "User Link",
count(*) as "Edits"
where posttypeid = 1
and lasteditoruserid is not null
group by lasteditoruserid
order by count(*) desc