Of course Korg pianos seem to be behind in their piano sound. If you play piano for solo'ing, then you're better off getting something that sounds rich and authentic, e.g. PSR2000? or Roland? Digital pianos.

Anyway for some piano applications you need to sound clear and cutting though the mix when you play along with a band. Roland has a good array of bright and mellow pianos, so does Yamaha. Korg on the other hand has their pianos sounding perfect in a band situation, but it lacks depth, and thickness in a classical type solo'ing.

Of course I don't think a single piano patch can be used in all music types. It depends on the type of music and on deciding what piano's are perfect for the song.