Yeah, the main performance improvements are very pleasing. Load times are a big draw. If you don't have them on PS3, get them on PS4. If you can afford them. If you do have them on PS3, personally I wouldn't bother getting them again, but if you want to, then that's fair enough.

I mean, I'll get 2.8 on the PS4 when I get around to completing all of 1.5 and 2.5 (still need to complete BBS, for example).