I have no exposure to Nikon cameras and it would cost me a small fortune to switch.
I won't let that stop me from making a comment, however.
I think only a handful of photographers push their gear to its maximum potential. I'm not among them. I do pretty well with the gear I have but I'm not skilled enough to get close to their limitations with the possible exception of dynamic range. I only really come up against that when shooting white egrets or herons against a dark background and I have learned how to handle that. At this point, I can get the exposure close enough to make minor adjustments in Lightroom or Photoshop.
That said, I know some landscape photographers shoot high dynamic range scenes day after day. In those cases, Nikon might be a better choice though the 5D Mark IV had probably closed the gap some.
As someone here on POTN said: if you are getting poor results from a current DSLR, it's likely not the camera's fault, but your own ( a loose paraphrase.. and I can't remember who said it first).
Kim (the male variety) Canon 1D IV | 6Dc | 16-35 f/4 IS | 24-105 f/4 IS |100L IS macro | 70-200mm f/2.8L IS II | 100-400Lii | 50 f/1.8 STM | Canon 1.4X III
RRS tripod and monopod | 580EXII | Cinch 1 & Loop 3 Special Edition | Editing Encouraged