I don't want anyone to think this s another 'mine is better than yours thread' It was not the intention. All the keyboards mentioned have great things to offer and are priced accordingly. The Audya costs more than a BK7 or PSR 950 and so you expect it to sound much better. But it seems many still don't understand Live audio fully or how much is available to Audya owners in the Style View editing mode.
As lovely as the Roland drum kit samples are (and they are very good) they are only as good as the style writer, changing the kits and effects cannot get around the programmers ability, (I think they must be keyboard players playing drums on a keyboard and then editing in a sequencer.) If Roland, Yamaha and Korg want to continue with Midi voicing they need to look at how they produce the styles - A Drummer and Midi Drum kit would make a huge difference to the end result. Perhaps they could afford to do this, wheras making the move to streaming technology as ketron have is probably not worth their while.