A set of Zeiss Super Speed lenses is setting you back well over $20,000, while a set of Zeiss ZF SLR lenses are under $6,000. For the extra money you get a focus that goes clockwise, bigger, unified housing, longer throw and smooth (declicked) aperture. All this is nice to have, but how about sheer image quality. Do the “cheap” ZF SLR lenses hold up against professional cineglass?
Ryan Walters did a great comparison test of the Zeiss Superspeed Lenses (MKIII) with a T-stop of 1.3 and the SLR lenses were the Zeiss ZF lenses with a T-stop of 1.4. regarding sharpness, color,breathing, vignetting, and the mechanics
The results of his tests are pretty surprising, check them out Ryan`s website: