I am massively disappointed by the mirrorless "revolution" because I (falsely) assumed mirrorless equals small & light.
I was looking into the Nikon Z, Canon EOS R, and Leica SL cameras but was shocked when I saw how large & heavy the lenses are. Completely defeats the concept of a compact mirrorless system. No, thank you. It brought back all the bad memories I had with my Nikon D610 camera that I ditched because it was simply too large & heavy to carry around all day. APS-C is a different story and much more appealing to me, especially the Fuji line of cameras and lenses. But if I ever switch to digital, I'll probably get a digital M because it is a small & light system with a FF sensor. But the verdict is still out for me whether a FF camera actually has any benefits.
Sony E mount and L mount alliance have some smaller, lighter primes. Sigma make some excellent small primes with apertures in the f2-3.5 range, and Sony have similarly sized primes. Of course, you can use M mount lenses on some mirrorless bodies with decent results, which is what I'm doing at the moment with my Panasonic S5 and assorted Leica, Zeiss and Voigtlander lenses, mostly the Summicron 50, Distagon 35 and sometimes the Summarit 75. I also have the 20-60 kit lens and 50mm f1.8, the latter proving very useful for photo and video.
As for the standard zooms etc in full frame mirrorless cameras, the designers are finally figuring out how to make them marginally smaller and lighter than the DSLR predecessors. The Canon RF 70-200mm f2.8 is an example.
I haven't used aps-c cameras since the Fuji X100 and Ricoh GXR, but it's only natural that aps-c lenses will be smaller and lighter than their full frame counterparts. And m43 lenses are even smaller, except for the Olympus f1.2 Pro primes. Interestingly, I prefer the feeling of shooting my Panasonic G9, which has a grip like a midrange DSLR, compared with the much smaller and lighter GX85, which has a terrible grip, and buttons that are easily pressed by accident on the back.
As for the M-D 262, I would LOVE one of those, or a M10-D. I really dig the simple action of using a rangefinder with the option for EVF for lenses outside the RF envelope. When finances allow, I will definitely look into this.
