Subjective camera preferences.....

Sorry, but I can't really follow your decision and preference logic and how one can prefer a GX7 over an E-M1 to an extend that the latter stays at home. The body size difference isn't that large. Honestly, if someone has a problem to carry an E-M1 to the field, I doubt, if a camera system (I.e. a camera with interchangeable lenses) is the right tool for him. I carry the E-M1 wherever I want and enjoy the superior ergonomics, which is even more important. The GM1 is a no go camera for me, as it is too small for a system camera and because there is no way to attach an EVF.

Also, again, I can't understand, how one can drop a camera because of the menu system, especially if the camera is designed to have almost no need to consult the menu, like the E-M1. Although it is preference, I think that the "bad" quality of the Olympus menu system is overrated. Having used and compared a lot of other manufacturer's menus, I think the Olympus menu system is no worse, in fact, to me it is a lot better than others (Sony, Canon, Fuji) And about on par with Panasonic. But Olympus menu system bashing without reasoning is very popular.

Anyway, if I buy a new camera, I know beforehand, what I buy. Thus, I won't never change a camera, because I don't like it or because I don't use it. I buy a new camera for the sake of a better view finder, better ergonomics, handling, and performance or better IQ (which is hardly the case nowadays).