Ist post only because I lost my old ID. Nikon user (and famous at that) - I wrote the Sony A7r vs Nikon 810 blog that had over 8,000 readers. In that blog I documented over and over how the D810 was superior to the A7r for total IQ.
Now equipped with a D850, a good selection of Nikon, Sigma and Zeiss lenses including a full Otus set, I find myself less than enthused with a Nikon mirrorless and refuse to buy a Sony because of unethical business practices.
IMHO - Nikon doesn't need a mirrorless camera - what they need is the Highest Quality EVF in photography. I am tired of using a clunky 3x loupe to get critical focus out of my Otus lenses and the D810/D850. I'd easily pay $1000 for a well designed EVF than I would pay any money for a whole new infrastructure of camera gear.
I still have all of these Leica lenses, Contax Zeiss, some M43, the f-mounts.... enough. I about ready to trade in all in for that little Lumix with the tilting EVF.
Nikon should think more like Porsche instead of follow the leader. Make enhancements every year to the 911 and eventually arrive at the line up they have today.