I have Panasonics, a GX-80 and a GM-1
The GX-80 is a fantastic camera, everything about it is spot on, topped off with incredible image stabilisation which allows decent hand held shots that have never been possible with any other camera I've owned.
The GM-1, no longer available, was and probably still is the smallest M4/3 camera ever made, it shares the same sensor as the GX-80, but otherwise much simplified, no viewfinder, not the same image stabilisations, most buttons missing and where the same features are available they're tucked away in a menu.
I use the GM-1 far more than the GX-80, I never thought the size difference would bother me till I had the choice, the GX-80 only gets used if I'm going out specifically to take photos, the GM-1 gets carried around all the time.
If I were buying again, I'd be tempted to go down a sensor size to 1", from the photos I'v seen they don't lose much and are considerably smaller. Also, despite the GX-80 having an adequate viewfinder, I tend to use the tilting screen more, there's not many situations where I can't position it to eliminate glare and it isn't as good as some I've seen on more recent cameras. If looking now, I'd prioritise that over the viewfinder.
Lastly, fancy five axis image stabilisation has bits that rattle, I don't know how robust it is, but it makes me nervous having it bouncing about on a bike all day.