OVERVIEW:
The Panasonic G85 is the first camera I would buy if I was an aspiring (budget) filmmaker, because it has good IBIS (In-Body Image Stabilization) a decent 4K sensor, weather sealing, a flip-around screen (if you do vlogging) and a mic input. The screen is quite accurate (almost as good as the GX85) which I think this is important when you're just getting into filmmaking (it helps one make focus and exposure judgements quickly, without attaching a monitor).

MAIN POINTS:
PART 1: IS IT PORTABLE?
PART 2: IS IT AFFORDABLE?
PART 3: IS IT COMMON?
PART 4: HOW’S THE QUALITY?
PART 5: IS IT EASY TO USE?
PART 6: NEEDS ADD-ONS?
PART 7: WHERE DO I BUY?

PART 1: IS IT PORTABLE?
I believe it is, and even though the used price of the GH5 is getting lower, some people think it’s too big (and I think that is one of the reasons the LUMIX G85 is still popular).

PART 2: IS IT AFFORDABLE?
Yes. Yes. Yes…and I kind of hope it stays that way (on the used market)! I say “I hope” based on watching the GX85 go up in price on the used market, after it became more popular…of course that could be due to the fact Panasonic hinted that it’s cancelling the rangefinder style GX-series.

PART 3: IS IT COMMON?
Yes (on the used market) and no (on the new market. The good news is that it is a much better deal used, so I’m not too worried about the lack of availability new.

PART 4: HOW’S THE QUALITY?
I can comment on this part only if in comparison to the other cameras I’ve used (which include the LUMIX GH4, G7, GX85 and FZ1000). Any other comparisons would be only based on watching somebody else’s footage, so I’m not going there. Compared to the GH4, the 4K footage of the G85 is much smoother (less speckles/noise) but less color-accurate, though the GH4 color can be off in CINELIKE D. Compared to the LUMIX G7, the weather-sealed body of the G85 is better, and the G85 IBIS is excellent, but the image of the G85 still lacks in the area of what you might call full-spectrum color, which the G7 actually does better at (even though it tends toward have more vibrant color than the actual scene had!) Compared to the LUMIX GX85, the image is identical, and I say that after testing both bodies with the same 50 lenses I’ve tested (however, this makes the GX85 and G85 a great 2-camera pair)!

PART 5: IS IT EASY TO USE?
I would say the IBIS (In-Body Image Stabilization) makes this camera one of the easiest cameras to use ON-LOCATION (because you don't need a gimbal or a heavy tripod to stabilize it). The traditional CAMERA form factor might make this something people don't want to rig out, but it can be done (watch Nigel Barros' videos on YouTube) but for around $300-400 US, this camera has a lot going for it. As I mentioned about the GX85, In STUDIO circumstances, this camera (and the GX85) aren't the only options in this price range. I've tested the old GH4 and G7 in the studio and they work great (and Sony has a few non-stabilized cameras that produce a really good image) but ON-LOCATION the IBIS of the G85 and GX85 make them really easy to use (no gimbal is needed, and smaller tripods work well). The IBIS on the G85 and GX85 is so good, there isn't much you can't do with it (including handheld movement). The negatives would be that the sensor isn't too good in low light (an f/1.4 is sometimes needed), and the AF is the old pre-phase detect style (contrast-based) technology. So, if you need good AF (autofocus) you'll have to get a newer, more expensive camera.

PART 6: NEEDS ADD-ONS?
You could get a cage, but other than that, it doesn't really NEED any add-ons. I used to use a speed booster (from Viltrox) but after I dropped my camera, and it scratched the sensor, I no longer recommend it (the optic of the speed booster protrudes into the lens opening more than OEM lenses, so it hit the stabilized sensor when the camera hit the ground).

PART 7: WHERE DO I BUY?
It's not a (comparatively) good deal to buy this NEW (on Amazon, etc.) but it can be a REALLY good deal when purchased used. The used prices are actually pretty good from places like KEH.com and UsedPhotoPro.com, and they're often good on Ebay too. The surprise though was that all of the local camera stores in my region (Seattle) have had good prices on this too (they're actually better than the average Ebay prices at times!) Private party deals will vary of course, but I'm starting to see people getting rid of these with some pretty good optics (the 12-35 2.8) for a really good deal. I saw this happen with the GH2 and GH4 a while ago, and it can be a really good deal!

CONCLUSION:
I've tested this camera (with about 50 lenses) and I can say that it is a workhorse. Depending on which lens is used, this camera can output some really good footage (and it's even better with my custom, lens-sensor specific settings LOL!) There are some downsides (the color takes getting used to) but after you work with it a while, this camera is a workhorse, and with the exception of the AF, is pretty easy to use (especially with the IBIS). For the price, I don't know of any better option.