Oscar, I hear that the lenses are identical to their thread mount versions.
I have the 21mm on the Kiev. It's S-M-O-O-T-H, and focuses with the focusing wheel. Worked on the Nikon and of course, on the Kiev and I just used it for a roll of IR film (which I screwed up developing, but that's another story, involving stopping development for a sudden interlude- plain tap water DOES NOT completely stop development!)
I'd get 'em all, if I could. If I still had a Nikon, that 50mm f/1.5 really sounds great.