I'm still on the fence for this camera. I was considering either this or a GX7 as a carry everywhere with small primes and the 7-14mm in a small Domke kit.
I played with a GX7 a month or so ago at my local camera store, I liked how it felt. They were breaking up a kit and offering the body only for $800CDN. I was very tempted.
I played with a GM1 a little last week. A cinematographer friend had one and the 12-35mm 2.8 on it to use as a director's viewfinder when scouting locations, to take quick stills for lighting tests and reference video of things.
The menus weren't too bad, not that different than my older Panasonic bodies. It was kind of silly with the 12-35mm lens on it. I can see how it would be lovely with the 14mm/20mm or the kit zoom on it.
Since my current 'carry all the time' camera is my Canon S95 in a belt pouch, I don't think the lack of OVF/EVF would bother me.
And both the GM1 and the GX7 keep dropping in price. Maybe if I wait long enough, I can just buy both and carry the GM1 with kit zoom and a 14mm pancake all the time and take a GX7 and primes kit out when I want to do more "serious" shooting?
Chris