Don't they use tech that allows puddles to dynamically grow and shrink? I remember that being part of Infamous on the PS4. It's not exactly new tech and it's not super demanding because they don't use real time reflections, just prerendered cubemaps. GTA V does the same thing.
There's also a dynamic time of day which makes lighting comparisons very hard until you can get a hold of the game.
I gotta say, 4 pages of bullshit with nobody seeming to come to a very logical conclusion about this. Are you all lost to the idiocy of platform wars that you are willingly ignorant to basic logic?