Some weeks ago I thought about exchanging the Biogon with the smaller C-Biogon because of the size. But I'm too content with the picture quality of the Biogon. Really love this lens.
I've used both and it really comes down to your preference... do you value size over speed or speed over size? They are both just that good.
Not to be argumentative, but I think that intended use matters, at least a little. Going to shoot relatively more wide open, close-up subjects expecting great bokeh? C-Biogon f/2.8. Going to shoot relatively more stopped down, mid to longer distance subjects? Biogon f/2.
Not that either lens doesn't do both well. They do. But they are different.
See, I didn't find them that different to be honest. I thought the f/2 Biogon's bokeh was fine and they are both super sharp stopped down.


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Zeiss Biogon 35mm f2.0 at f2.0 and 1/8 s - handheld. TriX in Rodinal 1:100 for 19 min.