I like “vintage “ style lenses, which drew me to the idea of the Voigtlander 35/2 Ultron II M mount with an adapter ( I have a couple of screw mount Leica bodies but don’t see me getting an M Leica for the immediate future). I don’t mind manual focusing but with a dumb adapter M to L adapter , e.g. Novoflex, would I not have stop down metering only? That may be a step too far and perhaps better and cheaper option would be Sigma 35/2 DG DN Contemporary. On paper the Voigtlander 35/2 Apo Lanthar is sharpest but that’s before taking into account possible smearing due to thickness of S1R sensor stack.