Very nice comparison.
This is very good keyboards, both of them, and to me it boils down to my personal liking.
Out of this demo, again I think Yamaha is more CD'ish and not as warm and soft EQ'ed as Korg.
Looking forward to the day I have both brands 'big brothers' in the rack......

Anyway, to me Genos is the best sounding arranger made by Yamaha so far.