I'm considering picking up either an excellent used condition Nikon D810 or D3X since used prices have come down significantly lately, it's now an excellent opportunity to pick up a good deal on a Portrait, Fashion, mainly as new Studio setup with some light Photojournalism Street work outside. My main concern is absolute only the very best Image Quality, Color Rendition, Headroom, Dynamic Range. Then FPS , how fast, and how many MP doesn't concern me so much, anything around 24-36 MP range is just fine enough for the Portraiture stuff I do. My Main Prime lens is a Nikon 85mm 1.4 G. What would you recommend? What's the Pro and Cons with each Camera setup? Is the D3X still relevant in 2018 for Portrait and Studio work or has it been surpassed by D810? If I had the money and it wasn't an issue to spend freely on new equipment, I would go with either a Nikon D850 or Fujifilm GFX50S Medium Format, as I've been a Mamiya RZ67 Pro II and 110/150mm lens Kodak Portra 160/800 film user for years. I would appreciate all of your comments and good suggestions from your own experiences with your Nikon D810 or D3X setup. What's your advice on this?