I have this lens on the pre ww11 Contax that my dad got me started in photography with in 1954, I find the lack of contrast quite charming it produces a lovely retro feel to the images, however this is not to be confused with lack of definition in terms of l.p.m this is a very sharp optic, it's just that the greater contrast adds to the apparent sharpness, something that lens manufacturers realized later IMHO