I've pretty much switched to M43 for the time being. The IBIS and nice cheap and cheerful lens selection attracted me, I just can't afford the Fuji lenses I actually desire. I'm never tied to any make or model, and I will always be that way. 2 years ago I was shooting Nikon FX, gave Fuji a try and really like the system, but like I say, the tastier lenses are just out of reach for me. I got a Panasonic G80, an Olympus Em5 a 25mm 1.7 prime and a 40-150 lens to start with. I may well return to Fuji at some point, but for now I am actually enjoying the change. I love the IBIS, it's amazing. I can shoot handheld at 1/4 and get sharp night shots. With the G80 I can shoot 4K video for less than half the price of an X-T2 [I got a great deal on the camera brand new for less than some used sites have them] and I can actually look forward to buying some primes and macro lenses, as the ones I fancy are really cheap compared to Fuji's. I decided to ignore all the BS about sensor size, APSC users really shouldn't get in on that as there's really very little difference. When people rant about M43 being too small, they're comparing to full frame, and even then they are exaggerating. Sure, at equivilant ISO levels M43 files can be a little noisier, but it's also easy clean up. And dare I say, but when noise is present it just looks like noise, not smeared or smudged pixels like some cameras do at higher levels. It's easier to get sharper shots wide open with primes because of the difference in DOF too.
Apart from physical size of the bodies they are the very same, the sensor is identical.