Not like I need another camera, but it would be interesting for once to have a full 'kit' in any given format. By the looks of Ebay, Pentax screw mount cameras and lenses are the best deal going.

The first question - are the primes generally considered the equal of, say, consumer AF primes from Canon or Nikon?

Second question, as the subject points to - are there certain M42 lenses considered to be the classics, the cream of the crop? I read that the 50/1.7 is sharpest of the normals, but I'll probably pick up a 50/1.4 for the little bit of extra speed.