Well I got a voigtlander for my Leica M I have a 24 summilux and sometimes I need a little wider. I tried the 21 lux and quite frankly that lens with it's dream like out of focus areas irritate me I do not shoot for lens affects. This is a very nice low light lens this shot is at iso 6400 1/30 of a second at f1.8. Glad I took the chance on it after hating the 50 norton and disliking the first 15 voigt