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Quick comparison between Contax 21mm @ 5.6 and New Zeiss 21mm EF fit @ 5.6.
!00% crops using Canon 1ds3, tripod, live view.
Had a good look at both these files very little difference with optical performance except the Contax has a cool look compared to a warmer look on the Zeiss, pictures taken within seconds of each other.
Contax 21mm F5.6
Zeiss 21mm F5.6