Samin

That is a result of the 5-axis stabilization. Whether it's Panasonic or Olympus, it's kind of unavoidable and present to a certain degree on all these cameras. The FZ1000 for example is like really really loud, I think (even when switched off, as otherwise gravity would have it's way with the freely moving elements when they're not supposed to move at all). It's not thát bad on these cameras, but the built-in mic does pick it up ever so slightly (you won't actually hear it recording something on the streets of a busy city, but you will when shooting a test in a silent closed off room). Then again, I'll hardly just solely use the audio from the video. And if you do, use a suspended directional mic as with the G80/G85 you now have a mic jack, anyways.

Drop a smidgen of warp stabilizer on top and you're good to go, I'd say. This is the best thing in their current line-up (unless you're more geared towards photography, then the GX8 has some features that might make that one more interesting). Of course, the GH4 has its use and the GH5 is going one step further yet, if not an entire leap and both bring those video production qualities to the table. But the GH5 is going to be double the price and take another half a year...
Don't get why hardly anybody seems excited about this one. Everybody seems to either drop specs for the ease of use of the Canon (dualpixel AF & color) or actually go for the more exciting specs (Sony) and 'just deal with it'. Unless they're going more pro/expensive (Blackmagic, Sony F, etc) or for the stills side of things (1DXII, D750, X-T2, etc) or clinging onto something older that's being looked after (NX1 hacks, ML with the 5DmkIII). Everybody was pretty serious about using a GH2, GH3, GX7, G6, GH4, G7... I guess the landscape has changed. In the beginning it was just the 5DmkII, T2i/550D and GH2, which naturally evolved. But where does that leave Panasonic in the current market? Is its major target now people entering the video segment, rather than those who are already? People on a budget? Aren't there more people who just like to shoot video and like the possibility of just having something really basic and compact to carry around? Is bigger better? I know there's still a few who like the M4/3 system and give Panasonic some love for what they do... but it feels like it's getting slowly getting less, even though their cameras do keep improving.