Welcome to the Forum. I don't know much about the sxp-50, except that it's a portable piano, but I can tell you that the piano sounds on the KN7000 are superb. I believe the piano samples on the KN7000 are the same as those on the Technics pianos. However, the keyboards on the KN series are not weighted. They are touch sensitive and also have an after touch facility.
You can get more information on Technics keyboards here : http://www.technicskn7000.com/
Hope this helps......

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Willum

Looks like we were typing at the same time Alec..

[This message has been edited by Bill Norrie (edited 03-23-2003).]
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Willum

After silence, that which comes nearest to expressing the inexpressible is Music.
Aldous Huxley
( especially when the music is played on a KN7000....)