The Ketron sound in the first segment, had too much reverb (similating a large hall)..clarity was not the best, and overtones were a mess..The second segment of the Ketron was better..I think it was a different piano selected...same with the third section..
I rather play a warmer piano than what I hear on this Ketron demo..

The roland RD piano sounds better than the FA piano (I thought they were identical)..The Rolands can be edited to sound any way you want..so they are hard to beat..
But we are judging these demos..RD does sound warm and more desireable to me..I did like the attack response from the Ketron..but the dynamics were better on the RD..

The Kawai demo also sounds good, but I did not hear a strong dynamic change, also not as warm.

The casio surprised me..compared to what I played..this demo was much better than what I heard live..it was less synthetic than Casio pianos I played..

All were good, and simply a matter of taste..

BTW: The more I watched and listened to the demos..the "hotter" she looked to me..