Couple with 85, I have been trying to figure this lens out. So far still it is mostly great if one has good MF skills. AF is quite fast, but hunting like h€ll. And seems to work at it's worst in close focus distance. BUT If i have used auto 9 or 33 point focusing, it does some how work, but then again you are in hands of AF alone. It did work okay thou. Experimenting continues. I can see the potential of this lens, quite sharp actually and it is nice on K-1. I like FA and DFA* colours more, but it is not bad still.
edit: played little a bit more today with auto 33, both AF.C and AF.S mode. It is actually not so bad. Focus is quite good, just have to have that
AUTO 33 on. Also it chooses points close center where it focuses, so you can have pretty good control over it. I'm relieved now and happy about my purchase. Even if I have 70-200, and it is exellent, it can't do what fast 85 can do. I will explore more on this lens. It certainly will be part of my portrait shoots, while DFA*70-200 will be for almost anything else and portraits in good light and where I can find enough room for it. Or 31, or...