I went AR/Prep for PvPing, then decided that when I went back to a PvE spec I'd go Combat again to compare my damage output. The trouble is, we're getting our B team geared and keyed for Hyjal now, and I was subbed through all of TK, and I hadn't run SSC at my current gear level.
There is, however, a shred of evidence. There is a rogue in my guild (Elaii) that until recently, had slightly better gear than me. He still has a better MH, but most of my other gear is better than his (except trinkets and chest). Before he's outdamaged me slightly. On Winterchill, I outdamaged him by about 100 DPS as Combat Swords.