I am not a very knowledgeable photographer so I don't have too much to say except from a personal/hobbyist point of view.
At first I was surprised that the 14 Pro photos appeared darker than even the iPhone X, so dark under some conditions that the photos are far from "true to life" or what I see with my eyes, which is the result I tend to want in my photos.
But I think Apple tuned it quite aggressively so that it would provide good contrast under certain lighting. For example, sunlight on subject looks good, whereas sunlight toward the camera yields artificially dark results (darker than iPhone X), much darker than what I see with my eyes, though with good contrast.
For my purpose, I have discovered that now I almost always get the kind of results I want by relying on the vibrant photographic style (default is TONE +50, but can turn down to +40 or +30). The results that I am getting now are consistently better than my old camera, at least for my taste. And night photography is also noticeably better. And the camera is intelligent enough that it does not simply brighten everything, so that even if I do not adjust the settings, the photos are not just blown out even in bright sunlight.
Again, this is an amateurish take, but I think other users who take photos mostly "to make memories" might find this information useful.