Both keyboards sound very good. However, there are some distinct differences, at least to my aging ears.

The Swing and Jazz rendition sounded much fuller when played on the Yamaha. And, the right hand voices were sensational by comparison.

The piano and string rendition of Lion King was excellent sounding on both. Again, the overall depth provided by Yamaha's piano and the robust quality of the strings was far superior to the Korg.

Unplugged styles used for Wonderful Tonight were great in both keyboards. The song chosen was not really suitable for the style, though. The guitars on both were very good, but again, I would have to give Yamaha the nod for the realism of the guitars.

The Orchestra Tuti styles were both pretty good, but the depth of Yamaha's overall sound was far superior.

The Country Strum was a real toe tapper on both keyboards. The right hand voices on the korg, however, sounded thin. There was far more depth and expression on both the style and right hand voices with the Yamaha.

The blues styles were nearly identical (great style for Mustang Sally). The drums were definitely hotter with the Yamaha, the distortion guitar was outstanding, but Yamaha's harmonica sounded a bit thin.

Obviously, the EQs were set a bit differently, but the difference in EQ probably did not account for the overall differences in sound quality. Overall, for this particular demonstration, which was very, very good and appeared to to compare apples with apples better than any I've previously seen and heard, the nod would, IMO, go to Yamaha. The S-950 had depth, polished sound quality, and better sounding drums. The Korg sounded good, but it seemed to lack the expression and depth I wanted to hear from a quality, arranger keyboard.

A big thanks to the folks in the UK that took the time to put this together,

Gary