This brief comparison is probably not worth the paper it's printed on but here goes. Grabbed a bag with both cameras in it this am and went looking for something to shoot. As the morning went by I found myself grabbing the M1 more and more. I found that little things about the M1 body appealed to me more then the M5. eg: position of the off/on switch, position and size of the playback, menu, delete and info button. The raised position of the rear dial so I wasn't sticking my thumb into my eye quite as much. I use the HLD-6 on the M5 so grip was not a major difference except that the M1 didn't need the HLD-7 which was also in my bag. It didn't seem to matter which lens I stuck on each body the M1 felt easier to shoot. Very subjective I know and meaningless to anyone else. I've been shooting with the M5 since last June and with the M1 only for two weeks but am sensing that my future preference will be with the M1 if I'm only going to go with one body on a photo shoot. I think my M5 will be relegated to my bicycle trips as it fits nicely into a bike bag behind my seat. The M5 body and the 9-18, 25 f1.8 and 45 f1.8 make a nice small but capable setup for shoot and scoot shots. As for quality of pictures from both bodies I'm more then satisfied. When I returned I printed a 13"X19" (A3) print of the same subject (wall mural) with the same lens (12-40 f2.8) from the same viewpoint on each body. My most severe critic (my wife) could not tell which body took which picture. For me it was a fun and very informative outing. YMMV.