The Korg's sax is a little brighter (and "honkier") and a tad shallower, but both are very well done indeed.
I hope the next PSR S-series has some SA2 Sax sounds, especially the SA2 Jazz Sax found on the Tyros4 which has even more realism due to the SA button controls and player's technique affecting pitch bends and scoops.
But, neither of these Mid-Range instruments have nothing to be ashamed of...keyboard sounds are becoming almost alarmingly real, and sometimes the only difference might be the skill of the player in doing instrument emulations.
The demonstrator in the clip is a competent player, to be sure.
I can't decide which one I like better...they both have their merits, and they are both very realistic, but in slightly different ways...probably in the way two different brand saxophones would sound being played by the same performer.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.