I can't help but wish that posters actually knew the equipment they talk about. Am I missing something? I have taken many thousands of shots with the D850. My takeaway is that either folks don't know how to use the D850 or, worse, have never even laid a hand on one. It makes me want to give up such discussions altogether. It seems that threads no longer have any intention of staying on topic.
It's not just this forum, but is ubiquitous. Often it seems like posters are filibustering to avoid buying the D850. Sorry folks, but not every opinion is considered... IMO. LOL.
Pretty pathetic...
About D850 vs D500:Captured through the viewfinder of MY D850

, the difference in view between D850 & D500:

( Please notice that the first image(D500 viewfinder) is a simulation based on the image taken with my Phone though the D850 viewfinder.)
And how you see the AF point coverage in your viewfinder makes the big difference for me when you compare D850-DX mode vs D500 for wildlife photography (Sorry, under while the bird was gone...):

( Please notice that the first image(D500 viewfinder) is a simulation based on the image taken with my Phone though the D850 viewfinder.)
About Focus point coverage and the way you see it in your viewfinder, D500 beats D850 & D5 hands down.
About D810 vs D850...What's wrong to prefer a build in flash commander system over a bulky accessory, even for a professional user?
What's wrong to like the advantages a PUF provides on certain occasions, even for a professional user?
A sample taken
handheld with my "prehistoric" D800e & 105 + 2xTCIIIe combo and the mighty PUF:
A screenshot of the AF area as seen in NikonViewNX:

And a 100% crop of the AF area:
My opinion about the D850 after more than 6 months shooting with it and approx 5500 images:
•
The best camera Nikon offers until today for studio photography.
•
The best camera Nikon offers until today for landscape photography.
•
The best camera Nikon offers until today for LV photography.
•
The best camera anybody offers at this moment for macro shooters who work with non moving subjects, intentionally undercooled or etherized insects, partly because of resolution and partly because of the stacking feature.
• If you don't mind bulkyness and weight, while used WITH the battery grip and D5 battery and in good light,
the best "all in one" wildlife camera anybody offers at this moment
TMHO, there are much better options for high iso photography though:
A D750 if your budget is limited. (D750 blows away D810 at iso 3200+ ànd is significantly better than D850 from iso 3200 upwards).
A D4s or D5 if you don't mind weight or price.
TMHO D500, -while used in good light-, is a MUCH better action camera because of the viewfinder & AF point coverage differences as mentioned above ànd -of course-, because of native 10 fps ànd 200 NEF buffer.
For people like me who prefer D810 in a combination with D500 over D850 because of the benefits it provides for my kind of photography, a very good friend of mine who is a professional photographer and teacher wrote me the following:
"The good thing about the D850? It reduced the price on the D810!
The D810 is good enough for 99.99% of the photographers out there!"For the future though, with a
Nikon FX mirrorless in my mind and if it will be as I would like it to be:
• with F mount or "in-house" Nikon F mount adaptor,
• with streaming magnification possibility in your viewfinder,
• with PUF and flash commander on board,
• even more resolution than D850 actually provide (75MP?)
• with very wide AF point coverage in viewfinder, like Sony pro FX cams.
• .....
..., D500, D810 ànd D850 might become obsolete, and probably even sooner as we expect.
Just my thoughts...
Kindest regards to everybody!
Stany