A terrific and versatile camera

I've had the G85 for about 16 months now.  Depending on what I'm doing it is either the second choice camera (after the E-m1 mark I) or the first choice.

I have two major gripes with the G85 that keep me more in the Olympus camp:

• The G85 tends to blow out highlights more often than the E-m1 mark I given normal metering.  Note, I see the same behavior on my other Panasonic cameras (LX-10, FZ300), and most of my Olympus cameras are similar to the E-m1 mark I.  I like shooting events, particularly renaissance faires and steampunk events, and the men in these events tend to wear white shirts, which tends to get burned out.  Now, there are various ways to fix this, and I've been trying them over time.  In general though, I want to be able to hold the camera in my hand, raise it to my eye, take the phone, and put it back down when I see a decisive moment coming up.  If I have to adjust the exposure compensation, enable/disable dynamic metering, and/or play with the tone curve, either the decisive moment passes, or the subject twigs that I'm shooting them, and will change their behavior.
• I shoot JPG almost exclusively, and the G85 is more heavy handed than Olympus is in using noise removable software, which sands away the details.  Yes, I've set the NR parameter so it is less noticeable, but still, I tend to feel more comfortable in restricting the G85 to ISO 3200 at the most, when my E-m1 is set to ISO 6400.  I do enough shooting using available light, that I tend to grab the Olympus over the Panasonic.  Again on my other two Panasonic cameras, I notice the NR sander more often.

That being said, there are some distinct advantages for the G85:

• The viewfinder uses an OLED display, which means it can be seen in either shooting orientation when I'm wearing polarized sunglasses.  Unfortunately, I need to wear polarized sunglasses pretty much all of the time when I'm outdoors in sunlight to cut down on the frequency of my migraines.  My three Olympus cameras with viewfinders (E-m1 mark I, E-m5 mark I, Stylus-1) all use a TFT LCD display, and portions of the screen is not viewable with polarized sunglasses when shooting in landscape orientation.  I can generally use the EVF to frame a shot, but I wouldn't be able to do something like manual focus with it.  Note, the Olympus E-m10 mark II/III and Pen-F use OLED for viewfinders, but those bodies are not splash proof.
• Shooting videos is much better on the G85.  I shoot videos a few times a year (1-2 weekends where I'm shooting nearly 8 hours/day video of various performers, and few other times, like a few nights ago, when I'm recording an entire show).  Panasonic just understands video a lot better than Olympus does.  The G85 has replaced my old JVC camcorder (EX-210GZ) as my main video record unit.  While it doesn't have a headphone jack to monitor the sound level like the E-m1 mark II and GH5 do, it does support adding an external microphone.  I use a AZDEN SMX-10 microphone, and it cuts down on recording peoples conversation behind me.  At the moment, I only record 1080p video.  The continuous focusing for video is better than my Olympus cameras, but not as good as the JVC was.  If you have the USA version (G85), you can record single performances more than 29 minutes and 59 seconds.  Unfortunately, if you have the European versions (G80/G82/...) you are limited.
• You can externally power the G85 a lot easier than you can with Olympus cameras.

In terms of weather sealing/splash proof, I do find myself shooting in wet conditions at times.  I've been shooting with splash proof cameras since 2004 (Olympus E-1, E-3, E-5, E-m5 mark I, E-m1 mark I, and now Panasonic G85/FZ300).

Taken with Olympus E-5, 14-54mm lens.

I tend to think of it like using four wheel drive in mud/snow/etc.  Having four wheel drive isn't a guarantee that you will be protected.  But when it is very slippery, muddy, etc. out, I would rather be driving my Suburu Forester (with all wheel drive) than my wife's Mustang (rear wheel drive only).  Of course when the weather is great, you might prefer the Mustang.

That being said, I have taken the G85 twice on whale watches, along with my E-m1 mark I and appropriate splash proof lenses.  Both times I got splashed pretty badly (normally I don't get splashed).  I was able to rinse off both cameras with the distilled water I bring with me and keep in the car and the cameras were both fine.  However, I had just gotten a used Panasonic 100-300mm mark II lens, and it stopped working for a bit.  I was eventually able to get it working again, but I no longer trust Panasonic lenses for sealing like I do with Olympus lenses.  I don't recommend exposing your camera to ocean spray, as it can corrode things.  And if Olympus/Panasonic decided not to honor the warranty if something broke, I would understand.  But rain does happen.