It is my expectation that the Zeiss Sonnar 35/2 will outperform the Leica 35/2 Summicron-M ASPH at Æ’/2 and Æ’/2.8 (and perhaps Æ’/4), and match it at Æ’/5.6 and Æ’/8. I am not basing this on the fantasy-land Sony MTF charts. But we shall seeâ€” real camera lenses (not lens designs) have to be built to high tolerances to pan out.
The Leica Summicron-M 35 mm f/2 ASPH lens by itself costs about US$3000, which is more than the $2800 Sony RX1 which comes with the non-removable Zeiss Sonnar 35 mm f/2 lens. If the RX1 optics merely match the Leica Summicron-M, Sony will have accomplished something extraordinary: an exceptionally capable and remarkably affordable full frame compact camera.