wellllll... ditched my 5D2 and picked up an A7r. using a $25 full manual fotodiox adapter for now, which will work perfectly with my rokinon, but if i want to change apertures with my canon lenses, i'll need something like the Metabones. it took a lot of fiddling to figure out as the manual is crap. i had focus peaking set to high and figured i was good to go. wrong. everything was out of focus. finally figured out how to turn on magnification and focus is all good again.
this was with the 24-105L