Sony Alpha A6600
I love this Sony Alpha A6600 camera for still images. I was looking at a7r4, a9 and this. I had a9 autofocus on a small camera and it basically wanted what this was. I was okay to give up the full frame due to extra reach due to crop conversion and overall weight loss.
With this Sony Alpha A6600 camera, I bought a Sony 10-18 F4 lens, a Sony 70-350 G lens and Sigma 16mm 1.4 lens. All of these lenses are sharp and the AF is perfect. The part I'm most happy with is the combination of the a6600 and 70-350. It's just the incredible power I have in my hands for wildlife photography. I'm equivalent to a 525mm with a9 AF in a package under 3 pounds. I can easily catch birds in flight with a sharp focus. The lens also fits portraits very well.
Large batteries, camera grips and IBIS are all welcome. The only thing I wanted was a video. The rolling shutter was bad and I got used to the 4K 60p on the GH5 and GH5. If you're trimming Bifs, you'll also want more megapixels.