I have two of the 50/2 lenses, a few years apart, one for each of my bodies. They remind me of a Summicron-R. I've had two of the f:1.4s, one of the f:1.2 50s, and the f:2.0s are the ones I kept for the image quality. They have a tiny bit of barrel distortion at the very edges, you have to look for it but it's there.
Originally Posted by msbarnes
The 105 is everything you've heard it was. Maybe better. I hold mine (a Sonnar) in very high regard.
The 28/2.0 has CRC and a very good reputation, although I haven't used one.