But all of them have far superior corner-to-corner performance than the. The Voigtlander 35 APO and Zeiss 35/1.4 are large, the Leica 35 APO is incredibly expensive, and the Zeiss 35/2.8 is slow. Theses lenses all have their pros and cons. I also have an earlier version in Sony E mount, where the EFV assures focus at all distances. Zeiss 35mm f/2.8 Biogon Voigtlander 35mm f/2 APO Leica 35mm f/2 Summicron APO Zeiss 35mm f/1.4 Distagon.
However, the more I shoot with it I realize the performance is really very good, regardless. On my sample that works for one distance, but focus isn't quite perfect at different distances (slope of cam must not be perfect). It uses a "ramp cam" design, and comes with instructions to calibrate the focus exactly to your camera. The 7-Artisans 35 f2 M mount is tiny, and is impressively sharp at f2, besides being so cheap it's worth a try. It makes lovely pictures, but isn't as sharp as the Biogon. I also have the Voigtlander 35 f1.4 Nokton II, and love the small size. The Ultron would probably be great, but I don't care for the mechanical design.
When I got an M10 I switched to a 2.5 35 Summarit, which is about the size of my 1971 35 Summicron, and I am very pleased with it - easily the equal of the Biogon, if slightly slower. I used the Biogon f2 on my M9, but also felt it was too large.
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