Michael Schoenfeld here,
I posted in the "motion and video" section because I purchased it for my FS700 video camera. I am primarily a stills shooter, but I have also shot a lot of motion projects in the last 7 years.
It's the real deal. Metabones found a real need and filled it elegantly IMHO. I don't use sony stills cameras (Canon 1DMKVI and 5DMKIII), but I'll bet it's fabulous on any NEX series camera using Canon glass (I've got a pile of L lenses, including 14 F4 TS, and all of them, including the Macro 100L works as advertised).
A tad sharper; full frame circle on APS (super 35 in my case); and about a stop brighter.
Michael Schoenfeld www.michaelschoenfeld.com