I can now confirm that my Zeiss ZM 35 f:2.0 has no issues whatsoever with my NEX 7. I tried colour shift, and haven't found any. I looked for corner softness, and couldn't find any, even at infinity wide open, contrary to what has been reported by others. In my case, at infinity wide open, sharpness is a bit less than in the centre stopped down, as is illumination. That is the case with pretty much all lenses, and has nothing to do with NEX 7 issues.
Furthermore, my experience with NEX corner issues is that magenta fringing is the first problem to appear, and corner softness "only" happens in more severe cases. This converges with the fact that pics from lenses such as ZM 18 can be cleaned up in Cornerfix, which takes care of colour but can do nothing is the corners are mushy. A similar situation has been reported (but I haven't verified that yet) with the CV 12 and Elmar 24. So an issue with corner softness on ZM 35 f:2.0 wide open, but not stopepd down, but no magenta shift, is not congruant with this experience.
One observation which might or might not explain matters. On my camera, I use a Voigtländer M-mount-to-E-mount adapter. My ZM 35 is the only one of 7 lenses where infinity is right on the infinity hard stop. The 6 others reached infinity before the focus ring reached the hard stop. So an adapter just a tad different from this one might not let the lens reach infinity wide open, with corners showing it the most, and all righting itself with more DOF when stopping down. Just a guess.