Ross Harvey posted his hands-on preview of the Nikon D850 with sample photos: “In short: I am seriously impressed.”
Check also Dan Vojtěch’s report with sample photos at different ISO and 100% crops.
More sample photos
Photographyblog has a set of sample full resolution JPG and RAW photos:
Sample images from Ephotozine:
Nikon D850 JPG sample taken at ISO 11,400 from TechRadar:
Links to the official Nikon sample photos:
Update: Dpreview posted more high res sample photos.
Pre-orders: B&H | Adorama | Amazon | BuyDig | WEX | Jessops
Nikon D850 Facebook Page | Nikon D850 Facebook Group