The quality of a particular sound is down to personal choice, which is why if you go to various forums you will find Piano sounds from all manufactures will be called poor by someone. (EG, I wouldn�t touch a Yamaha Piano sound as they sound awful, my Roland is much better, and then someone else would say, compared to my Ketron, both are rubbish, etc etc)
In truth (These days) there is no such thing as a bad Piano sound, but just different types. (My current favourite is True Pianos http://www.truepianos.com/ (Video demo http://uk.youtube.com/watch?v=zsd2SJThgjU ) which I find outstanding when loaded into the Abacus)
Enjoy whatever you decide to play.

Bill