In a whimsical twist, I just popped my ps4 copy into my PS5 this last week to see how it had changed. I can tell you, it has VASTLY improved. The game on PS4 was constantly on limp mode, crashing somewhat often. Looked like junk, not much to redeem it. Managed to get through the whole game, but never really explored or adventured much past the story - was just too painful to try to do much more than that.
The PS5 version is actually so much better, and even visually reaching the point of impressive. The gameplay feels like I imagine they meant it to, including some fun gun- and knife-play. I’m also enjoying the story more now that I’m not constantly worrying about a crash. Do recommend a revisit if you’ve played and were disappointed (don’t worry, I recognize my PS5 may be what made the difference haha).