I didn't listen to most of the other OSTs which are praised this year (I have only seen 15 minutes of Nier at a friends place), but I really love the Persona 5 OST. I imported it on CD although I usually rarely listen to OSTs and I have listened to it quite a bit. The only other OST I own is Ni No Kuni, but that one I maybe played once of twice.Possibly. I think there could be a tragic outcome, like them giving best OST to Persona
From what I have heard there are some good contenders this year for best soundtrack, but I don't see why Persona 5 shouldn't be a possible winner (that said, although I didn't really heard them yet, I am sure Nier and Zelda have great soundtracks as well and I wouldn't mind if one of those win instead).