Hi Scott and others,
the guy demoing the PA3X Pro is Raffaele Mirabella; he is an excellent player and he also works for Korg Italy but, as has been noted by Ian and others, is essentially a pianist; his chops can be appreciated in the following videos, where he is demoing a Kronos and I think that he does a very good job.





It has to be furthermore said that, while the Kronos demo was part of a tour officially sponsored by Korg Italy, the PA3X video looks and sounds like it was shot by someone with a cell phone, while Mirabella was simply playing the instrument for the store owner and a few attending clients, who don't even sound particularly interested, as can be inferred from their ongoing chattering.
All this goes to show that, given today's technology, one has to be very careful when playing in public...