A short while ago I
tried testing the Samyang 12mm f/2 on the Sony A6000 against the
Samyang 14mm f/2.8 on the Sony A7. It didn't work well because the 12mm
f/2 was decentered. Now I have a better copy in my possession and am
looking forward to trying it out. Full test should be up in a day or two.
Two verions of the Samyang 12mm f/2 at f/2.8, mouse over to see the
difference.