I am glad this thread got revived
For me, the body is still the D810 -- I have not succumbed to the extra pixels (and cost) of the D850, nor the smaller size of the Z7*, but it is certainly an interesting option now.
My lenses have changed to lighter-weight versions, so the ARTs are all gone; now it would be the 50/1.4G, 28ASPH and 20/1.8G. I finally did get the 70-200/4, and used it for one trip --- it is a great lens optically, and reasonably compact, so it was a good choice. But in my case I used only about 3 times at the middle focals around 150. So I might now add a Sigma 150 macro instead (smaller/lighter than the 180, but reputation is not as good, so need to check one out).
*With the Z7, lenses get interesting. I'd for sure get it with the 50/1.8Z. But from there at this time, I'd need the adapter for the above lenses. (And dedicated lens limitations is frankly one of the reasons I've avoided even trying out the Z body.)