I've heard some quite remarkable Arabic and Balkan stuff all done on a Korg... sadly, few in the West are going to use that as any kind of indicator of whether the Korg will be good for THEM.
My take is, good demo or bad demo, I know I can make anything sound good. There really aren't any modern TOTL arrangers that truly suck. So, after that, it's more a case of the features, the form factor, the styles and the TYPE of sound. Most of that is only truly realized after a hands-on...
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An arranger is just a tool. What matters is what you build with it..!