I think that the closest to the fm2 in digital
Could well be this Olympus om digital.
I bought three 4/3's. The OMD and gh3's for video.
The Gh3 are great, amazing at both motion and stills.
The OMD I love, it's like a film camera to me in the fact it's not too big, actually could be 1/8th larger to be perfect.
The files are great, kind of neg film like, really beautiful and pastel if you like, though don't really go above 1000, actually 800 is as high as they should go without issue.
The files aren't medium format detailed, or cmos dslr smooth, I think they're just pretty and have gotten use to the evf, actually like it.
With film I had omd2's, then Nikon's FM2's (great cameras - lasted forever) and f3, loved it . . . sort of, a N-90 great camera, an F5 amazing camera, an f4 I didn't like and dumped it in a few weeks.
I really hope olympus makes one more upscale version of the omd, rumor has they will, or they won't, but I love shooting with it, love the 4/3 crop and the olympus lenses are freaky good.
All they need to do is make their next version work well with their legacy 4:3 lenses like the 150 f2.
This is mine with a panasonic Leica 25mm.
IMO
BC