I hate to say this? or maybe im happy to say this... but so far from these demos - the S950 is sounding wayyy better than the Tyros 4.

Its punchier / more live / more realistic!!
Those drums and distortion guitars are phenomenal!

the only big drawback still holding me back is the shallow mushy keybed, But I think the good outways the bad here!! and its half the price of the T4!!!