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Didn't try it out yet, but sharpening is gone entirely in the 4K modes on the GH6, which now look identical to the 5.7/5.8K recordings. So 1080p may be even better, less processed looking now. 4K and especially 1080p on the GH5 had way too much sharpening applied for my taste. Glad the overprocessing is a thing of the past. 🙂

The first thing OP mentioned was quality above all else. The other crucial information needed would the type of production setting/workflow the camera will be used in. OP also mentioned being prepared to manual focus, so this has me believe the shoots are more methodical and can allow for lighting around camera EI between takes, extensive grading, etc. For that, yes, get the Blackmagic 6k or Zcam offerings. Absolutely. These models are made for controlled sets and crew support. But if that assumption is wrong, and you need anything that is even remotely related to the nature of snapshot shooting, you'd be better off with a sub ~$4k mirrorless system that offers usability perks (AF, IBIS, dual gain/ISO performance, battery life, form factor, and so on).

..If you don't like noisy footage, 6K Pro will be a step backwards in that regard for anything above base iso. You'll not only be losing AF but also IBIS. Also keep in mind EF mount means very little lens adapting choice. Finally be prepared for massive file storage requirements. Now don't get me wrong I love BMD IQ and the 6K Pro is great value but switching to it from a hybrid mirrorless system is a much bigger transition than just losing AF imho.

This is Panasonic's hillbilly battery grip that is supposed to work with the GH6. I guess you are supposed to stick a V Mount battery hooked up to it up your ass. 😮 Like my mother used to say when stuff was fucked up, "Some man must have designed it". https://shop.panasonic.com/cameras-and-camcorders/camera-accessories/camera-parts-power-battery/dmw-dcc17