OVERVIEW:
This is the Panasonic GX85, formerly one of the most underrated 4K cameras out there. I think it has one of the best IBIS systems available to date (even better than the GH5) probably because of the substantial weight of this little camera. It's got a small (2x crop) Micro Four Thirds sensor, but after testing it with over 50 lenses (mostly adapted vintage lenses) I can say it's capable of outputting pretty good 4K video (especially with my custom "lens-sensor specific" camera settings). This camera is a great budget filmmaking option and it's currently my preferred #2 camera (the G85 being my primary, because this one doesn't have a microphone jack). The image from the GX85 matches the Panasonic G85 perfectly, so the settings I use are almost always the same (this makes sense to me, because it uses the same sensor, with possibly slightly different image processing). The screen on this camera is one of the most accurate I've ever used, and it's good enough to make focus, exposure and even color judgements. The GX85 is VERY useful as an architectural (perspective control) camera because the rangefinder style design allows it to use a tilt/shift adapter (Nikon to M4/3) whereas the G7, G85 and G95 bodies cannot (due to the pop-up flash over the lens mount).

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?
It's small, but it's heavier than you'd expect. I think this does help the IBIS work better, but some people (MarkusPix) wish it were lighter. It's also portable in the sense of charging, because the battery can be charged using the Micro SD port...so you don't need to carry a charger (even though I do, as well as a couple extra batteries, because they don't last too long). I do run it from a power bank on longer shoots but remember to put it in "Silent Mode" if you do this (because some of the 5v to 9v upconverter cables don't always provide enough power).

PART 2: IS IT AFFORDABLE?
Yes. Almost all of the gear I am experimenting with is affordable, but this camera is especially affordable when buying it used (body only) though It can be a good deal when you buy it new as well, when it only comes in a kit with 2 lenses. The problem (for me) is I almost never use these two kit lenses for video (the 12-32, which has no manual focus option, and the 45-150 which only works well OUTDOORS because of the 5.6 maximum aperture). For my OUTDOOR TELE work, I almost always use a 1990s vintage Nikon-mount 70-300 lens anyway because of both the price ($30-$80 US) and the longer focal length. I don't use the AF on this camera, so I don't really mind using manual focus on adapted lenses like that one. The point is, the GX85 two-lens kit can be a really good deal new, but I don't need those two kit lenses, but you can sell them off and buy something else with the funds.

PART 3: IS IT COMMON?
This is a difficult question for me to answer, but I'll start by saying it's a lot more common (on the used market) than the GX9 (which is becoming pretty rare). The good news is the GX85 kit has been on sale almost every year (around Christmas) and so I'm guessing a lot of units have been sold, but it seems to be harder to find now than it was before...may be due to the fact that we've been told this type of camera is being discontinued by Panasonic. It's certainly not too late to find a used GX85 though (as of the time of this review) but the prices are going up, and it's becoming more of a collector's item than a bargain camera at this point.

PART 4: HOW’S THE QUALITY?
I've tested the GX85 right alongside the G85, and the quality of the output is identical (if you compare shooting in the NATURAL profile). The GX85 lacks a mic input jack, weather sealing and CINELIKE D, but I actually prefer the NATURAL picture profile, so I consider the GX85 the perfect 2nd camera to go with the G85. The 4K output on the GX85 (and G85) is pretty good (especially with my CUSTOM SETTINGS) and the IBIS is super good on both of them as well (but actually better on the GX85 in my opinion, probably because of the weight/balancing of the camera).

PART 5: IS IT EASY TO USE?
I would say the GX85 is an INTERMEDIATE level camera, as far as ease of use goes. It's not super easy to grip, and the AF isn't that good, but I use it on a dual-camera cage and use either touchscreen assisted focus or manual focus, so the old contrast-based AF is not a problem for me (it is slower as far as workflow is concerned though). In STUDIO circumstances, this camera isn’t the only option in this price range (I've tested the old GH4 and G7 in the studio too, and they work well). ON-LOCATION however, the IBIS of this GX85 makes it very easy to use (as no gimbal is needed, and smaller tripods also work well). I often say that my camera recommendations depend on the type of shots you're trying to get (static or moving) but because the IBIS on the GX85 is so good, there's not really much you can't do with it (including handheld stuff). The form factor of the camera doesn't work for everyone, and there are some negatives in certain scenarios (like you can't really do vlogging with it as the screen doesn't flip OUT) but overall I think it's a really good tool. Yes, the AF is the old pre-phase detect style (contrast-based) but my workflows have always been to use manual focus anyway, so I don't really mind. If you need AF, you'll need to get get one of the newer cameras though (S5ii, S5iix, G9ii, GH7, etc.)

PART 6: NEEDS ADD-ONS?
Yes. I almost always shoot using a dummy battery and a power bank (and you MUST use only the electronic shutter with the adapters I have). That means the battery it comes with doesn't last that long of course, but with the power bank I have had the camera run for over 2 hours without a problem (and there's not a record limit, so that is good!)

PART 7: WHERE DO I BUY?
If you can find it new as a kit (with the 12-32 and 45-150 lenses) it can be a pretty good deal (and even better deal when it's on sale sometime before Christmas). Then regarding buying it used, the story has changed as it has become more popular. It used to be available used for around $300 US every day, but the used price has gone up to around $500 (around here anyway).

CONCLUSION:
If I only had 2 cameras, this would be one of them. Notice I didn't say "only ONE" as I "always shoot with 2 cameras"...but this thing is so versatile, it would be one of the first cameras I would buy, and it matches the G85 sensor output almost perfectly, so those would be the first two budget filmmaking cameras I would buy (if I was on a budget). There's so much to say about what this camera can do, and I know my approach of using it with a TILT/SHIFT adapter isn't necessarily popular, but I think it's one of the best reasons to buy this camera (at the price point it's available for).