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the zeiss super speed 25mm T1.3 MK I. The MK II and III probably have better coating but, they don't have the triangular reuleaux iris like the MK I.
also yes, these are cine lenses, fuck you.
the contax/yashica zeiss lenses are optically similar to the MK II and III super speeds, they're good lenses to get if you have an adapter for your digital.