Hi Chony,
I know, but it is still a user created sound being put up against a factory sound.
He's included the sample set, so I doubt he's just tweaked an onboard sax sound.
Some of the Korg users use the sample section of their keyboards an awful lot.

If one needs to do comparison's, between Korg & Yamaha compare a korg sax factory sound to a tyros sax sound. Korg's big enough to withstand critisism. Personally I'm not that big a fan of the korg sax sounds , but this guys sax "sound" doesn't deserve critism. He's sharing his work.
Maybe someone can provide a User created Tyros sample set demo to compare it with.

best wishes
Rikki