I already edited my response, it was made based on an inaccurate read of your post. My bad.
Yeah I saw that after I had already replied.
I am curious though. But I'm going to go ahead and take a guess that probably only a handful, if that, were edited on FCPX. After FCPX came out, most editors stuck with FCP7, which some still are using, or switched to either Avid or Premiere. Maybe we will start seeing a few more, but I don't know if I could see that happening for big budget films that have more than just one editor.