And the same German demonstrator - Jürgen Sartorius - has made this comparison table:

Comparison KORG PA800 PA2X Tyros2

From this we can learn that the Korg Pa2X is basically a Pa800 with more keys (76 instead of 61), more sample memory (256 mb instead of 64 mb), and more sliders (9 instead of 2). But it wont have the great built-in speakers of the Pa800.

Kind regards,
Yamaha PSR-S770, Korg Krome 61