Hi,
I own a Roland VR760, extended with the SRX piano. I also have a Korg PA1xPro. Both piano sounds are acceptable, certainly in a band situation, where the details of the overall pianosound are left out. However, neither Roland or Korg come even close to the piano sound of my Yamaha P90.
This instrument I play at home, when the sound is really important and every detail is "hearable". I tested almost every stagepiano available in the store; this is really the best. Not to mention the true feeling of playing a piano.

But anyway, it's said before. Taste is personal and if your ears tell you otherwise: go for it.

Grtz,

CK