Interesting range of Nikon mounts there.
The f3.5 18 Nikkor, is a very, very sharp lens, I would be quite interested to see how the Zeiss lens stacks up against it. Rob, does the Zeiss have floating elements, as the Nikkor does?
I have the f1.4 85 Nikkor and we put it up against the Zeiss 85 f1.4 equivalent, last year. Possibly on an optics test machine you may notice a difference, but frame to frame there is virtually no difference. We also enlarged the negs and couldn't see any real difference.
There were differences, focal length was slightly different. We used the same camera on a tripod and focused each lens at infinity and received a slightly different field of view. Both of them also worked better ½ a stop down and really good at f2. Both worked brilliantly in the 2.5 metre to 5 metre distance wide open in lowish light, which is where I presume the manufacturers figured is where they would be most used.