All three lenses came out very well and in comparison with other makes can all be qualified as excellent. There are a number of noteworthy differences. You must remind yourselves that the differences noted are only visible when using the utmost care in taking pictures. Note also that Leica is competing against itself when introducing new lenses. Summicron-M ASPH 35mm gives a high contrast image image with excellent micro contrast and a crisp rendition of extremely fine detail from center to the well into the outer zones.
Light fall off is noticeable, but restricted to a very small zone.
Flatness of field is outstanding as is the definition over the whole image area. Summilux-M ASPH 35mm also gives this same performance, but the finest details are rendered a fraction softer at the edges. The difference between Summicron-M ASPH 35mm is the coverage over the image field. Center sharpness is a mite better with Summilux-M ASPH 35mm, but this lens loses more detail when going to the outer zones. This is visible at 30 times enlargement.