What can I say about the d850. I bought it as a gift to myself this year, coming from the nikon d3500 that I have been using for 2.5 years.
The d3500 is very good for an amateur and quite satisfactory with a good lens. With the upgrade, I saw an incredible difference in resolution, of course.
In addition, the d850 has a great ISO performance with beautiful noise that simply disappears with noise reduction, and the noise is black and not with green, red, and blue pixels.
"And the 4 images I uploaded were taken with ISO 6400 in auto 64-6400, as it was quite dark in the park. With a little sharpening and noise reduction, even in the original raw/jpeg, you can't see anything."
I use it for food, wildlife, landscape, and real estate photography. Not that it doesn't perform well in other styles, of course. I didn't regret the money at all, and personally, I wanted the 45mp for the prints I make.
The dynamic range is incredible.
If you don't care about printing larger than A3, the 24mp will be enough for you.
The camera's autofocus is 99% accurate, the grip is perfect, and the sound of the shutter is very soft, it doesn't bother you at all. Overall, it's an all-around top camera that won't disappoint you anywhere. Plus, you can find countless good Nikon lenses at very good prices second-hand, but you need a good lens because of the 45mp for the camera to "show" the resolution. If you use something cheap, you're simply wasting megapixels.
And the best part is that the camera is immortal with very good build quality, so it's a tool that I personally bought to keep.
I don't even know how the video works, and I'm not interested in that part at all. Although it has 4K video and 8K in timelapse.