Another point regarding keyboard demos. Playing individual sounds on one keyboard and then playing a similar sound on another keyboard is just not a relevant way to judge how a particular keyboard is going to sound.
If that were the case...my old Kurzweil K250 would stack up pretty well. You have to hear the instrument playing in style mode or some type of ensemble mode to really hear how the instruments blend and interact together. This takes in to consideration the type of sampling used (stereo, multiple microphones, ambience, mono) to enhance the feel of a cohesive group of musicians playing together.
I think it was Don M. That said a few posts back...If you want to sound good OOTB, the Yamaha PSR-S970 is the way to go. (Sorry if I butchered your post Don)
Jingleman