I am not 100% but it does appear to me that they reduced the draw distance for the PS4 (how far we see) and removed npc's from big cities though I think patch 1.03 reduced npcs. Performance wise, seems the same though I have had little issues with fps with this game. Few dips here and there nothing too bad. I am experiencing more bugs now though unfortunately with my PS4 version, npcs in the air, talking to people through walls/closed doors in quest, quest not being able to be completed, all of which I had no issues with until 1.04 which is strange but I am not angry at all. I save alot and if I encounter a bug, go back and do something else. I know CD Projekt Red is working on this and its so much because its not just PS4, its X1 and PC too, all with different issues. Plus they are a much smaller group of people than other big game companies, so its unreal to think with a game this size and a small crew that it can be fixed overnight or even over weeks. I have all the patience in the world for these guys. Best game Ive ever played, even with the bugs and is the only good gaming company left in the industry. Just hope they don't over work themselves on this stuff and get some rest here and there to enjoy life! They are humans too! lol (^_ ^ )
-Zero