>>3093006That is my current setup.
40mm is a great focal length, and while the lens has some major vignetting and softness issues in the corners when wide open, it is great stepped down.
I can actually autofocus the lens with the Techart Pro adapter even.
While the upcoming native e-mount Voigtlanders are tempting lenses, don't disregard adapted ones completely. You would also be able to use the adapted ones on an m-mount film camera if you wish. Plus they can be autofocused with the Techart Pro.
If 40mm is what you are interested in, also take a look at the collapsable 40mm from Voigtlander, and the old Minolta 40mm f2 that came with the Leica CL.