Originally posted by NZ_Ross
I have a Zeiss ZK 35/2 and it really is a stunning lens in terms of the image quality achieved, and the ability to change the aperture on the K5 e-dial is a real bonus when using TAv mode.
The reason not many people on the forum have the Zeiss ZK lenses is three fold - first they are expensive, second they are becoming increasingly difficult to find, and third there are Pentax equivalents that are as good, or very nearly as good - particularly the limited lenses.
I certainly enjoy using my ZK35

Yes, the Zeiss 35/2 is really very good. Especially A3+ prints show the very high quality of this lens. It is so good, that I sold the DA35ltd (and that is by no means a bad lens!!) and accepted always having to manual focus, even on holidays. The prints I get from this lens are enough to make me put up with the MF and the extra weight.
I recently added the Zeiss ZK28/2, because 35mm is often too narrow, but although also stunningly good color wise, and almost as sharp, it doesn't have quite the finesse and fine detail that makes the 35/2 my favorite lens.
Chris