Leica Elmarit-R 35mm vs Summicron-R 35mm
I have only used the Elmarit, but my impression from various reviews was that the Summicron is only better in being faster. The Elmarit focusses quite close, which is useful. Some years ago I converted my Elmarit for use on a D700 but did not like the results and undid the conversion. Somehow the lens did not impress me so much with a digital sensor, whereas I loved it on film. I use a Zeiss 35/2 Distagon ZF1 on my D700 now.