While I understand why you would call the D5 the best, I would not agree. Certainly it is the fastest and most expensive but is not nearly best for landscape and portraits. The D850 is a much better camera in most categories. I don’t think I would call the 800 series prosumer cameras. There are many more pro’s shooting the 800 line than the d3, D3s, the 4’s and 5 combined. The big reason for their popularity is their awesome ability to crop
at 75% and still have tack sharpness. The D5 could do a wedding but the 850, 810 or even the 800 would do a much better job. If resolution doesn’t mean anything then you might as well just shoot with a 700.
I remember years ago, you would see more working pros using the N90s than the F4 despite the fact that the F4 was the pro model.
It will be interesting to see what the D6 has.