Disclaimer: I own the CV 35/1.2 version 1, the Zeiss 35/2.8, the CV 35/1.4 ... and of all these, the CV 35/1.2 is the lens I feel offers the most bang for the buck.
The CV 35/1.4 is a well-constructed lens, and I liked the 'feel' of it in the hand and mounted on the camera. But in heavy use, I didn't like the OOF blur, the annoying chromatic aberrations at wide apertures, the busy bokeh when shot wide open. But that's just me. Other people love this lens, and there's many reasons to enjoy using it.
The CV 35/1.2 is big lens for a rangefinder, yes, but not nearly as big as an SLR lens. It mounts nicely on my Leica M7 and away I go. The versatility it gives me is astounding -- I can shoot in extremely low light, and get fabulous images. In bright light, it holds its own against the Zeiss or whatever -- sharp, good colour, nice rendering all-around. I love this lens.
The Zeiss C-biogon 35/2.8 I haven't warmed up to yet -- it has a very strict, somewhat clinical look to the images. Technically, it blows many other 35mm primes out of the water -- but personality-wise, I'm not sure I like it. Not yet.
Anyway, I'll be selling my CV 35/1.4 MC lens in the next few weeks. I haven't used it for months, and I'd rather it go to a good home.