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You didn't ask this question, but just FYI...
I have both the ZF 35/2 (Classic) and the ZF 28/2. I think they draw very similarly, and are similarly sharp. Both have lotsa "pop".
I have the Zeiss 25mm classic lens, but in the ZE for Canon. I love it also! It's sharp as a razor blade, and the colors are bright and beautiful. I don't know about the ZF version, but the ZE version even, though it doesn't say it, can be used somewhat like a macro because it has a close focusing distance. I take a lot of flower photos with it because I can get so close, and I really like what it does to the color of the flowers. A+ lens.