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I couldn't find it, has anyone ever compared 35mm R Summicron V2 with Sony RX1?
Since no one else has responded, I'll take a swing at it. My opinion comes firmly from the peanut gallery, as I haven't done a direct comparison, but I've looked at both lenses/systems so maybe my ideas could be useful for you.
From what I've seen, the RX1 lens is very, very good. It is a superior optic to the Summicron. If anything, the Summicron is better corrected for colors--the RX1 has a slight bit more longitudinal chromatic aberration than the Summicron--but the RX1 edges out just about everywhere else. Resolution across the frame, focal plane flatness, distortion, and flare favor...Show more →
i own the rx1 and i've shot the R cron vII briefly around a camera shop. jon is basically right but the cron did not seem to be better corrected for loCA than the rx1. it's true that you can provoke loCA with the rx1, but it is rather difficult and small. the cron seemed to do it pretty regularly shooting metallic oof highlights.
basically the rx1 is a better lens in every measurable way (not sure about distortion though – i never checked the cron). the reasons to choose the cron over the rx1 imo are build quality/feel, distictive drawing style (glowier look with slower focus transition and distinctive field curvature), better manual focus, leica colors, and better camera.