Without doubt the Tyros range has better quality acoustic/real world instrument sounds and the Tyros 4 is the best examople of that even above the XS/XF workstations sounds , period. The styles are well programmed , expertluy balanced and tweaked and there is a hell of a lot more available yamaha styles than there are korg PA styles.
The korg has a fully featured and fully functional sampler, the Tyros does not, it has effectively a sample play back function and not a sampler. The Korg has deep editing features in every respect from the onboard sequencer through to very detailed sound editing and style creation tools which makes the korg a monster all round instrument for the musician that wants to create new styles , new sequences new sounds whilst still having the ease of use of an arranger keyboard ready to kick ass out of the box.
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