I'm not a piano player, but I can definitely tell it sounds better than the PA3X, and I was happy with that. It is different from Yamaha, but that's because it was sampled from a different piano. Yamaha pianos don't sound the same as Steinway, or Kurzweil, or Busendorfer. . I probably spelled those wrong...
I think you could not tell by listening whether it is an arranger or a recorded grand piano.