You have a D5

  • Like what you've got: Of course you do, stick with it
  • Dislike what you've got: Stick with it. Not exactly sure what you dislike. The only realistic side-grade path is the D850, which means you bought the wrong camera in the first place. The D6 really improves the autofocus and some smaller handling and JPEG issues, but isn’t a big step forward. Your other choice is to switch to a Canon 1DxII. You'll be giving up body build, vertical grip, battery endurance, and more in order to gain resolution if you go the Nikon D850 route. You’ll be changing to Canon lenses and controls if you get the 1DxII. You'll be changing to Sony lenses and control if you get an A9. One thing that you should consider is that Nikon will likely move to mirrorless in this line in the not-too-distant future (e.g. 2021-2024).
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