I bought the 75mm F1.8 when I bought my M9, because I had been shooting a lot with 50mm (75mm equivalent) on my RD1. I never bonded with it. I also had problems getting proper focus wide open or close to wide open. I later bought the 75mm F2.5 and really like it a lot, to a large extent because of its size. But I haven’t been disappointed by its quality. I also use it quite a bit on my Sony, and it makes for part of a nice compact travel kit. So the F1.8 got kind of lost in the shuffle: when I wanted character on either the Leica or the Sony, I put on an old Canon 85mm, and now, when I want sharpness (on the Sony), and don’t need compactness, I go with my recently purchased Sony 85mm F1.8.