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Ron, I do remember going through your comparison thread, which was very helpful. The CV wins for smoother out of focus elements for the most part compared to either ZM, but I find the clarity of the in focus elements to be superior with either ZM. The C-Biogon is, for me, a nice mix of the qualities of the CV35/1.2 and ZM35/2.
Michiel, while crop sensors have come a long way, there is not doubt that larger sensors have a lot to offer beyond the change in field of view, DR and ISO performance. One thing I really like with my 35/1.4 on the FX sensor is the vignetting and effects of field curvature you get when using more of the lens' projected image circle. You lose this with the lenses on the GXR, even though you get "more optimal" across the frame performance. There is more dimension to my FX images. Since you already have C/Y lenses, why not go for it? Even a used older Canon body would let you try it out for less. For me personally, I'd prefer to get to a point where all of my manual focus photography is with a digital M, and my AF and flash stuff would be on the Nikon.