MarkPS

The answer depends on what you want to shoot. I do a lot of street photography. I use a 35mm summicron on a Leica M10R. I did find that the 35mm was a little short for some scenes in Miami and I had to crop the frames a lot. I also have a Leica 90mm, which I found is a little difficult to use in the street due to the tight image and small frame lines in the viewfinder. I recently bought a 50mm Voightlander f2 APO Lanthar, which is a fantastic lens and costs 10x less than a Leica 50mm AP0. I switch off between the 35 and 50 but, candidly, to my surprise, I am enjoying the 50mm focal length. There is no correct answer. If I had to pick only one lens for street photography it would be the 35mm lens. If you want to shoot tighter images or some head and shoulders portraits then a 50mm is great. BTW, you can pick up a used 50mm Voightlander Lanthar for under $900. Another choice that you might consider is a 75mm lens. A 35, 75 combination might be what you would like. Again, if you want the 75, my choice would be either the Voightlander Nocton f1.5 or the newer Voightlander Ultron f1.9.. For now I am sticking to the 35, 50 and 90 combination that I own. Best of luck in your choices but you can’t go wrong.

The M11 has a difference in weight between the silver and black editions. The silver is heavier and made if a different material. The M6s weigh the same regardless of color.