This was with 135 L on 5d mkii. So an 85mm on a crop would be roughly the same
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This may help you choose:
Hey Norman...that comparison on the Digital Picture would appear to prove that the Canon is sharper than the Zeiss at f/2.8 (although the Zeiss sample is underexposed a little so it is tough to compare...but the Canon looks sharper).
That would go against everything I have read LOL!!! Can we chalk that up to variation in copies?
Sometimes I just don't know what to believe.
I tried to find another good comparison like SLRGear but they have not review or tested the Zeiss.
I will check into DxO...but I am not a fan there....
Thanks for throwing that into the mix! It should make CJ very happy with his choice!!!!!! I still love my Zeiss, tho.
For what it is worth DxO rates the Canon 24 much higher than the Zeiss 21mm on a 5DIII....
Zeiss is slightly sharper in the corners at 2.8, but the Canon gives you 2 extra stops and AF. You are right, the Canon does have bad coma at wider apertures, but it's okay by 2.8. If you're not sure you need the Zeiss, the Canon is the safer bet.