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: