Alright, figured that enough people have posted threads about vintage glass that we should just put our knowledge into one go to place.
Vintage lenses are great deals for spectacular glass if you are unaware
I just bought the pentax-m S-M-C takumar 50mm 1.4 I've read that this is better than the k mount version or the super takumar version. the SMC is the same as the S-M-C but with a rubber focus ring. the M42 mount version is radioactive though, and may have to have UV treatment to remove the yellowing.
Anyone know about the Zenitar 16mm 2.8? Kinda want!