Quote Originally Posted by Lee L
You could also find a used 40mm Summicron-C at a good price. Been using one for nearly 30 years and have had people claim 11x14s from it had to be MF with slow film and the right developer. The 40mm f:2 Rokkor M is the same lens, at KEH for $300 now in excellent condition. Looks like the 40 Summicrons have taken a big jump lately. Use to be about $250 in vg to excellent condition, now looks like closer to $350-$400 KEH bargain condition. But sometimes KEH bargains are in better condition than you bargained for. (Sorry 'bout that. )
The 40mm M-Rokkor is slightly more desirable than its optical twin, the 40mm Summicron-C, since it is multicoated and takes standard 40.5mm filters. The Summicron-C is a little weird in that respect.

There seems to be such a kneejerk tendency to try to divert people away from Leica optics that I sometimes wonder whether there might be a tiny bit of non-objectivity involved. I happen to have a 50mm Summicron (latest version), and it is for all intents and purposes optically flawless. There certainly may be better lenses out there, but it would likely be a test bench superiority, not something which would be noticed in practical use.