Good Morning,
It looks like you have quite a selection from which to choose. However, I will go ahead and add an additional suggestion. The Contax Carl Zeiss 85 f2.8 Sonnar T*. I have recently acquired one, and I still need to change the mount - I have just been too busy, and gotten home from work way too late, to get it done. The reviews that I have read indicate that the f1.4 version of this lens (Planar) has great performance from f2.8 and beyond, where as the f2.8 version is both equal to and solid wide open and across the aperture range.
For my landscape/cityscape needs, the f2.8 is very fast, and f1.4 is not at all necessary. The additional increase in the physical size and acquisition cost of the f1.4 just put this lens outside my consideration. The other impediment was that Leitax which has a mount conversion available only provides the f1.4 Planner version in a M42 mount. Personally, I find this a bit more cumbersome when changing lenses in the evening (in the dark) so the K mount conversion on the f2.8 is much more convenient.
I was able to acquire my f2.8 Sonnar for $325, plus an additional $100 for the K mount. So its not dirt cheap or inexpensive - its more than Rico's suggestions, but less than the $1,500 your looking at for the Pentax.
I also have the Contax Carl Zeiss 28 f2.8 Distagon T* which I have found to be equivalent to the FA 31 Limited - other than being all manual, and slower by 1.3 stops. I liked this lens so much, it persuaded me pick up the 85mm.