>>3650244>Canon and Nikon don't make 35mm M mount lenses as far as I'm aware so I'm not sure what you mean by that.Irrelevant and what he meant has already been addressed, but fun fact: You *can* get adapters to mount Nikon lenses on a Leica. Obviously you don't get rangefinder coupling doing this, but you can zone focus with a decent manual F-mount lens and it'd be usable.
(I actually have such an adapter that I bought on a whim, but I don't think I've ever actually tried it out, so pic unrelated)