Here's a small real world comment on the Nikon D-850. It's a sexy beast! After a year of owning it, this is the best camera I've ever owned. I'll qualify that... it's the best for me. Your milage may vary.
Recently I took my lovely wife of 22 years on a PhotoSafari to scout out a location I wish to shoot. I do this all the time. I go check out things first, then compose my image I wish to create in my mind, with the data I learn scouting. Well on this trip I took only one camera, my new Nikon D-850. Now please understand... I've been shooting Nikon for a very, very long time. Also I never go anywhere with only one body, this was a first. I also only took three lenses. Bottom line? I simply love this camera and all the awesome capabilities it has, more than any other camera I have ever had, and I've had a few. If you wish to see the list of my gear you can click here, but seriously. I simply do not wish to shoot any other camera now that I have the 850. It's lighter than my D-3 or my D-4, and has even more file size than my D-800 or my D-810.
If you're on the fence about this camera? Don't be. Below is one image, of the Ventura Harbor, right out of camera. Yup! Right out of camera! No edit. Import to LightRoom, convert to DNG, convert to jpg, and size it to post on the internet... sharp as a tack, with awesome dynamic range, and brilliant colors. My settings: D-850 - Nikon 24-70 @ 24mm - ISO 64 - f/13 - 1/200 sec - hand held - no filters. You can click on the image to see it larger. You be the judge. Thanks for reading...
UPDATE! This camera is so awesome I've sold most all of my other gear. I'm also no longer a "Nikon Only" kind of guy, either. Yes I've been shooting Nikon for five decades, and I used to use only Nikon Glass. This is no longer the case. I now use what I consider to be the best glass in front of the best sensor, with the best ergonomics for me, I don't care what brand it is. My current line up of gear has been updated on my gear list. Anything I might not "own"... I rent! My cash looks far better in my bank account than it does in some manufactures.