I had one. Used it with my MP. Very sharp, but I found it to be too contrasty, and I didn't quite like the bokeh either. Sold it off after 2 months, went back to my Elmarit-R with M adapter, which is also contrasty but has a more pleasing overall rendering to my eyes. Thought I'd save up for the 28mm Summicron, but got the G-Rokkor and now I am happy. The G-Rokkor is even thinner and lighter than the Elmarit, but only opens up to f/3.5.