Cary Knoop

Fredrik, great test but there is a problem with your comparison.
You are actually clipping the highlights in the GX85 scenes.  The GX85 provides video levels but does use out of range values for overhead.  So in your NLE or color grading application you need to bring the out of range values into legal to compare the shots.  If you keep out of range values then a lot of setups will clip the highlights because they expand limited to full range.
Here is the waveform before and after bringing the highlights into legal range.

The 100% values on the left are from the titles but notice there is more highlight information above it.  The right side has brought the highlights into legal range and obviously the titles are now too low.  For indoor it is not really an issue but if you make a video outside in bright lights the out of range highlights contain valuable information that you should not discard.
 

I made a small tutorial on how to fix this in Premiere Pro for the GX80 / GX85, see the following posting:
 
 

I made a small tutorial on how to handle out of range video levels in Premiere Pro.
Some cameras record out of range video levels, one of them is the Panasonic Lumix GX85 / GX80 on which this tutorial is based.
Hope this helps and please go easy on me, as this is my first tutorial.
The UHD should be available shortly as YouTube is still processing it.
 
 
 

Ask, they should have standards.  Typically it is -6db and I certainly would not go over -3db.
Also important is the loudness, you should run a loudness detector to see if you are within broadcast standards.
 

The GX85 allows ISO 250 and 320 but only if you setup the ISO 1/3 EV in the photo menu options.
 

What took you so long to answer!! Thanks Cary, good to know. But I presume the IBIS would handle it ok.

The Panasonic 100-300mm lens OIS does not work together with IBIS, the 100-400mm lens OIS does.
 

Nice recording!
Orangenz, out of curiosity why did you not upload this 4k onto YouTube?
I think your white balance is fine (but perhaps you corrected it in post?), but I find the footage a little under exposed (which is the source of those strong red and orange tints). 
If you look at the scope it is mighty crowded in the black and shadows region. 
I disagree with Vesku that highlights are clipping. 
Lighting is a bit uneven, some of the reflections are a bit harsh. 
I don't know how many lights you used but it is sometimes worthwhile to point one towards the ceiling to get a nice diffused base light of the whole scene which allows you to place the main and key lights a bit farther away.
And great bokeh balls!
 

Very true, I have it mounted on the GX85 with a Speedbooster and I feel sorry for the flimsy body
Low light performance at f/1.3 is great though:
 

Yes, IBIS is great, it's like a mini gimbal.
Hopefully Panasonic in the future will find a way to distinguish between intentional and unintentional pans to make this work even better. 
For instance pressure sensitivity of the body might be a way, "squeeze when you want to pan".
 
 
 
 

Very Nice!

Nice recording!
Orangenz, out of curiosity why did you not upload this 4k onto YouTube?
I think your white balance is fine (but perhaps you corrected it in post?), but I find the footage a little under exposed (which is the source of those strong red and orange tints). 
If you look at the scope it is mighty crowded in the black and shadows region. 
I disagree with Vesku that highlights are clipping. 
Lighting is a bit uneven, some of the reflections are a bit harsh. 
I don't know how many lights you used but it is sometimes worthwhile to point one towards the ceiling to get a nice diffused base light of the whole scene which allows you to place the main and key lights a bit farther away.
And great bokeh balls!
 

It is hard to qualify objectively what is "big" in this case. 
I think IBIS is great even with lenses that do not have IS.  Another great lens is the Panasonic 42.5mm f/1.7, that one works great in conjunction with IBIS.
 

Very true, I have it mounted on the GX85 with a Speedbooster and I feel sorry for the flimsy body
Low light performance at f/1.3 is great though:
 

San Francisco at Night with lots of bokeh balls.
Camera: Panasonic GX85
Lens: Sigma 50-100mm f/1.8
Metabones Speedbooster
Most scenes recorded with an aperture of f/1.3 using ISO 1000.
 
 

Limitations: 0-255, only a 30p (29.97p) option, perhaps more moiré IMO
Benefits: multiple aspect ratios (1:1 has 2880 vertical lines!), more creative options perhaps.

4k photo has different NR than normal video. At least in my GH4.
4k photo has less NR in high iso which may be good if using post NR. The noise is not "ruined" with less sophisticated camera NR.

These all sounds great however more importantly is there a dynamic range improvement and is there an improvement to the noise floor, if not it makes the whole 10 bit thing not more than a marketing gimmick.
 

Thought some of those skin tones looked a bit plasticy.
Apart from that it looked great.

Agreed, although the GX80/85 is currently discounted heavily and has in my opinion a better color than the G7 and has no time limitations (in the NTSC region) so that may be a good alternative.
Here are some shots made by the G7:
 
 

Agreed, although the GX80/85 is currently discounted heavily and has in my opinion a better color than the G7 and has no time limitations (in the NTSC region) so that may be a good alternative.
Here are some shots made by the G7:
 
 

Agreed, although the GX80/85 is currently discounted heavily and has in my opinion a better color than the G7 and has no time limitations (in the NTSC region) so that may be a good alternative.
Here are some shots made by the G7:
 
 

Agreed, although the GX80/85 is currently discounted heavily and has in my opinion a better color than the G7 and has no time limitations (in the NTSC region) so that may be a good alternative.
Here are some shots made by the G7:
 
 

Very creative!
 

@Jon Jacobs Auto-ISO in M mode is a frequently requested feature among still photographers, and many other camera manufacturers have had it for a long time. It has a number of useful applications. For example, when shooting sports on a field with some variation in light (shadows in an area of the field), you could set your shutter speed to capture the action without motion blur, aperture to ensure enough DOF, and allow the camera to adjust ISO for a proper exposure.
And if you can accept that auto exposure (P, S, or A mode) is ever acceptable for videography, then surely you could think of a use for it in video. Set shutter speed at 1/50, aperture for whatever DOF you're looking for, and then allow the camera to moderate ISO to keep a proper exposure. But it seems like you're of the mind that any time someone is shooting video with a DSLR they can NEVER use any form of auto exposure in any circumstance. I think that's a bit short sighted, but I guess you feel pretty strongly about it.