I have the 5D4 and have used it for several years. Wildlife in Africa with large pro tele lenses, landscapes with the odd wedding thrown in.
Its a good all rounder with a top lens selection. Sensor isnt cutting edge but good enough. I dont see a big difference in sensor performance compared to my A7R2 in real world application.
However the Nikon 850 is more modern and just a better camera. There have been questions raised regarding its AF tracking compared to the D5 though.
To be honest I wouldnt spend that sort of money on a terrestrial DSLR for astro as there are better options.
Dave
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