The gear obsession with YouTubers is totally out of whack with reality. YouTube's compression is so extreme that the average viewer won't see a difference between a GH4 and a GH6—and I mean they literally won't see it. The GH6 can shoot 1900Mbps video. The average person watching a YouTube video is getting 8Mbps or less. Yes, you read that right…8—single digits. Purists will balk, "You have no idea what you are talking about, that's 1900Mbps ProRes and it just makes it easier to work with… blah, blah, blah. The point is that almost all major IQ improvements over the last 10 years get demolished by compression.

The biggest real IQ benefit of something like a GH6 is really color, but the amount of people using color accurate 10-bit displays is basically zero. The closest people get to color accuracy is the iPhone/iPad, but even then people have various filters on like True Tone and Night Shift. And you can color grade any footage to look good for YouTube.

The only real downside to the GH-series is that DFD does not work great for selfies. To be honest, it's pretty trash. Most of the drama around AF is when people are shooting selfies unassisted, and PDAF really gets the job done here IF you want to maintain a shallow depth of field and have no operator.

What I don't understand is WHY people even want this. It looks terrible. Most people overdue it with the depth of field to the point where it ruins the video. Ideally you want a depth of field that's somewhere around 1-2 feet so you can at least get a whole person in focus and not just the tip of their face.

I see below that you are doing miniatures. The GH6 is more than enough. It will last you literally a decade, maybe more. The best IQ improvement you can make is likely investing in a macro lens that lets you just the right mix of compression and depth of field so that you can get everything in focus without overly distorting your hands.