don't know elsewhere, but in the UK the Tyros 4 is a bit cheaper than the audya (about 20 per cent).
As far as I can tell, they are both overpriced.
I don't understand why, when Korg makes a workstation like Triton, M3, etc, it's always priced at £ 1699, about half as much as Tyros 4.
Yet I would say that an M3 is an even more complex instrument...it can read sample libraries ,etc etc
I like arrangers more as I don't like thinkering and prefer to focus on music, but still, why the hell the Tyros and Audya are priced at over twice as much, is beyond me.