Ronny, yes, three very nice ones, any could be released tomorrow to rapturous acclaim by lens aficionados - lol.
The 35-70, which being MF could never sell today, is my second best 50mm lens, that is its strong FL where it has almost no distortion and a really solid performance. With respect to it and a few more of the better zooms, Dr Hubert Nasse:
"It is a common prejudice that the zoom is softer than the prime, but in reality this is not necessarily true. A well made zoom, at least in the middle of the focal length range, is very often better than the corresponding prime lenses; because the optical efforts - just the number of lenses and special tricks with lenses, complicated high performance glasses or so, is higher in the zoom than generally in the prime lens."
I have only one Zeiss, so its that one.. old hazy 50/1.4 C/Y. This time its actually visible (roof on right side has sorta "light leak" from sky). Also its pano.. reason for more details (original has 15 mpix).
Test c/Y 28 f2
wide open.. coronersharpness is not so god.. have to learn to use it properly and fokus right
but I donīt now yet
Thought this lens was similar performance as the Contax 28 f2.8