The camera which Panasonic can't decide what to call (GX80 in Europe, GX85 in the US and GX7 Mark II in Japan!) really excites me.
It's the first time that anyone has put 5 axis in-body stabilisation in a 4K camera which exceeds the performance of the stunningly good Olympus 5 axis system.
It's not quite as effective as a gimbal for sweeping handheld movement, but that pain-in-the-ass tripod you can certainly dispense with now, along with that Olympus 1080p mush too!!
GRAB A CUP O
I think it's the same video quality. If I could choose now I would definitely get the new G85 because of the ergonomics, bigger evf, mic jac, articulating screen, better battery life, optional battery grip, Cine D/V, etc. Especially if you don't need/want the GH5. But if size is important the image seems to be the same. I believe frame rates and bit rates are identical as well, but not 100 % sure.
Informative video about the G85: