The question is about the "best" 50mm lens in LTM but it seems that people rather comment on their favorites, which actually is more meaningful since the opinions are based on lenses used by these people. I prefer a Nikkor 5cm/2 over the Canon 50mm/1.8. My new favorite is on the way back from DAG. It is a Zeiss Sonnar 5cm/2 made by Zeiss in LTM for Sweden. I am told that it is one of 200 made for Sweden. Hopefully, it will have its own fingerprint. That's what I look for.