I got it...sadly. Basically, if you got it on PS3, this isn't too much of a leap. If you haven't played it since PS2, I say it's worth it if you're a fan. I never played the Vita, but I heart it was "meh." the one difference is that the PS4 version has restored the original music, where the PS3 version "updated it." PS4 gives you a choice.
Graphics are nice, but nothing to die for. If you told me this was PS3 I might believe you. Definitely a step up from PS2, but like I said, if you have it on PS3, this is nothing spectacular.
As for paying for it...I got the special edition because I thought it was a damn nice box. If you don't care about that, I'd say wait a few months for the inevitable price drop. There is nothing new or exciting here demanding that this be played immediately.