I find my S.C has good overall performance in terms of sharpness but I do not find it all that ergonomic, which is a personal thing, of course. I do feel the focusing seems to vary in it's resistance and smoothness as one turns it, which bothers me. I have also found, comparing this lens to my other mid-range lenses (Summitar, Summarit, Summicron DR, Jupiter-8, 50/2.8 Elmar-M) that the 40 VC lacks a distinct and attractive signature. My Canon 50/1.8 LTM was the same. Overall nice, sharp performance but just something lacking that the others seems to have. Again, very subjective, but I do not want just sterile basic sharpness. I want character and a signature look to my lens, especially when used with B&W, and the ones mentioned above, particularly the DR, have a certain something that makes my results rise above the typical. It's why I'm likely selling my 40 S.C VC soon. My Nikon lenses were like that, and it's why I eventually changed to primarily Zeiss and Leica glass.