I've just accquired 40mm summicron-c which I did some research and found some samples in flickr. The sharpness is great in flickr samples which lens was used with m4/3 camera. However, 40mm summicron-c that I got doesn't produce the same sharpness. The pictures look better than 40mm Hexanon at wide open but they still show some haze. Not as outstanding as 50mm summicron I borrowed from my friend. I wonder if my copy is a bad copy or the generic adapter affect the picture quality at wide open. I learned from internet research that Voigtlander adapter will have precise infinity focus and distance scale can be accurately used, but never know if it will affect picture quality. Any M lens users' opinion?