Based on long experience with 35mm on my M2, where the 35mm framelines are difficult even without glasses, I'd look forward to getting more "elbow room" with a .58x finder, and that would certainly be my choice in a Leica body, and indeed a major reason to get another. The .72x is great with 50mm. I also have a .6x Minolta CLE body, which has a bit of space even around the 28mm framelines, a good thing because 28mm has become a favorite!