I'm not sure if this is a violation but I thought this may help the OP
Any 28mm F2 lens doesn't come around for sale too often. That goes double for the Zeiss 28s, and triple for the Pentax-K 28mm F2.
But your timing couldn't have been better, as there is a newer (non-Hollywood) Zeiss 28/2 Distagon T* for sale on the forum
here.
Also the highly desirable and extremely rare Pentax-K 28mm F2 "Hollywood" designed by Zeiss with it's floating element
here.
The Pentax-K 28mm F2 is a Zeiss lens in a Pentax outfit. This makes it one of the most desirable of all Pentax lenses. This is the one I'd get if I were you.
Check out the thread monochrome suggested and check out the reviews of that lens that also include sample images:
SMC Pentax 28mm F2