got the PS4 version and pirated the PC version to compare the two. Feels mostly the same, cept a few rough FPS drops on PC now and then. While I can't really explain it, the PS4 version "feels" slightly better in responsiveness and reaction times. The PC crack is very janky, not even sure if I have a working game or if some shit is gonna be broken later on. Its not out officially until tomorrow on PC anyways, so thats probably part of the problem. The engine is pretty old/shitty though on both platforms, I definitely notice the lower quality textures and environment compared to something like Battlefield 4.
I'll probably just play the PC version since I can unlock all the DLCs and shit whereas the PS4 version will be much better for MP. PS4 controller works fine with PC version. There are a shit ton of graphic options for PC too, I have it currently set to highest setting on everything and FXAA, although dunno if MSAA or CSAA would be better looking. I'm pretty sure graphic drivers need some tweaking for AC4 though, and undoubtedly a few more game patches to fix bugs.