Here You can find all the MTF tests on Leica M lenses I was able to find in these years thankyou to the Italian editor Rodolfo Namias who permitted me to publish them. All of them are taken from Italian “Tutti Fotografi” magazine, so they are not translated into English, but the graphics are clear and easy to understand.
Leica Summilux M35mm f1.4 Asph
Leica Summilux M35mm f1.4 Asph II
Leica Summicron M 28mm f2 Asph
Leica Summicron M 35mm f2 Asph
Leica Apo-Summicron M 90mm f2 Asph
Leica Elmarit M 24mm f2.8 Asph