I own the 200 FA and the 150 FA and used it with the 645D and now with the 645 Z
My 200 FA is a really great lens and worth much more than it has cost. I would not hesitate to recommend it. Whenever somebody is complaining about the 200 FA it is either a bad copy or the calibration is just wrong or the shutter speed is to slow. You can use this lens without tripod, but to achieve best results you shoud have at least 1/500 shutter speed.
If this lens works on a Z it will work on film at least as well.
Compared to my 150FA it is a bit less sharp and a bit more "flat", the 150 FA is definitly a bit sharper has a better three deminsional feeling, but it is also 50 mil shorter
Color fringing is an issue with both lenses, you have to stop down a bit.
Best results with the 150FA start at 6.3 or 7.1. The 200FA gets better unitl you reach about f-stop 11
Used on tripods both lenses show signs of shutter vibrations (even when you use MLU) in the usual critical ranges. You either use a grey filter or increase the iso (not with film of course), This is true even if you have a very solid tripod/head coimbination. It is much worse with the D as with the Z. I used both lenses with longer exposures for night shots and the results are very, very, very sharp.
I discuss the 200 and the 150 a bit in these two blogs:
NATURBILDPORTAL: Falkland Islands, Austral Summer 2015 (go to examples pentax)
NATURBILDPORTAL: Summer and Autumn 2014 (go to marmots)
I hope this helps