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OP, can you compare the D4 to the 850?
Unless I'm mistaken, the 850 has a larger processor yet the D4 is much more expensive.
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As NorthPolar said, the D850 is a much newer camera than the D4.
For my type of shooting that I enjoy (high school football), I still really haven't found the "perfect" camera that fits my budget. High school football lighting can be really bad, and you need a camera that does high ISO really well. I haven't used the D4 in this situation (yet), but I don't really think it will be much better than my D750 that I have been using, which is actually pretty good in low light. I do, however, like the big battery, the big camera feel, the super fast shooting, and, the massive buffer.
I still have these cameras......the D4, the D750, and now have the Z6.
Am hoping the Z6 does better with "auto white balance", or whatever u call it. I haven't mastered manually setting my camera to the correct white balance, and am hoping the auto white balance in the Z6 does better than my trusty D750. So far, the one thing I am disappointed in with the Z6 is the battery life. I've never had a mirrorless camera before, and am surprised how fast it drains the battery compared to my DSLR cameras. I do have 4 good batteries, tho.
I've never owned a D850, but for my type of shooting, I think it would be better than my D4 in low light situations. Not sure if I answered your question.......I'm just a point and shoot guy, not a photographer.