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Image stabilization
What we see, is that the Lumix G85 is able to stabilize the video recording also with the Lumix G 20mm f/1.7, which doesn't have any optical image stabilization (OIS). And with the OIS enabled Lumix G 14-42mm II, the G85 does a better job than the GH4, as the G85 uses both the in-body image stabilization and the lens OIS at the same time.
This feature helps me a lot. When recording handheld footage in a dim light, I would previously use a non-stabilized prime lens, and had to apply software image stabilization in post processing, e.g., with Adobe Premiere Pro. That takes a lot of processing time, typically around 10 hours per minute of 4k footage in my experience. Now, I can use the Lumix G85 and avoid this extra processing for almost the same end result.
On the negative side, there is some noticeable hum from the sensor shake mechanism inside the Lumix G85. If you have very quiet ambient sounds, then you might get this sound picked up by the internal microphones.
There also appears to be somewhat less rolling shutter effects with the Lumix G85, but that could be a result of the improved image stabilization.
Autofocus
As for autofocus, it is disappointing to see that the Lumix G85 is way worse than the Lumix GH4, even if the GH4 isn't very good at 4k autofocus to begin with.
I would speculate that this comes down to processing power. Contrast Detection Autofocus (CDAF) and Depth From Defocus (DFD), the technologies used by Panasonic for focusing, require a lot of processing power. Supposedly, the Lumix GH4 has a quad core CPU image processor to be able to handle the video stream. Perhaps the G85 is not specified as with the same processing power, and cannot focus as fast.
With 1080p footage, though, I don't see much difference. The Lumix G85 focuses snappy enough during video recording when using Full HD 1080p resolution, in my experience.
