That should tell you something then.
The D850 will be a great camera. It may well move the game on but it will be out of reach price wise for many. For those people it won't be a great camera coz they can never afford to buy one. Same with the 5D4, D5, A9, 1DX MkII. They are all good camers but meaningless for very many photographers.
Nikon have some great features in their cameras 3D tracking being one of them but they'll be knackered if Sony ever stop selling them sensors which is perhaps why they aren't going into mirrorless. I've read that Sony keep some sensors back for their own use only releasing them to other brands after they have got the advantage out of them.
Nikon dropped the ball a bit with the D5. Ironically the sensor in the D5 follows Canon usual format. Giving DR away at lower ISO and getting it back at higher ISO. Nikon can't afford to do that with the D850.