I think that nothing sounds as good as the Audya, as far as sounding live. I'm still working on my sound with the PA3X, but I think I will get there.
I have owned Audya, several Rolands, including BK7m, G70, E80 and E50, most all Yamahas, and others from all brands.
I like the size and weight of the PA3X, as compared to Audya, and even Tyros (in this case, size more than weight).
The Korg has great vocal harmonizer and Songbook feature.
I love the sounds and styles of the BK7m, but there are some drawbacks to it, as with everything.
If it turns out the PA3X doesn't suit me, then I will most likely go to an Audya 5. I love having a joystick very close to my left hand, as the PA has, and as the controller for my BK has.
Of all the arrangers, Audya has best Latin styles (also best and most country-western styles).
The Audya is a little heavier, and the fact remains that in the U.S., if it breaks, only AJ can repair it, and that means shipping it away for a length of time. I've had great luck with mine and it did not need any repairs, but that is not the case universally. I sold it because of the weight and location of the pitch bend wheels primarily.
The bottom line is all the current, and even not-so-current, models are wonderful and you can make wonderful music with all or any of them. It's just a matter of finding the best fit for you personally.
DonM