I had an Audya 4 for over a year, it was more in the repairshop then in my homestudio..

Audya styles are great, but pa3x comes close in sound, and allows much more freedom to the creative player,
When you look at the main sounds, pa3x is much more responsive, espescially when it comes to accustic sounds and synth sounds, pa3x outshines the audya
Pa3x is much more a creative workstation, where audya is a great arranger...