I spoke recently with a friend who's a moderator on the Korg forum and he said that the PA800 is an excellent keyboard, but he and many others weren't going to give up their PA1X's for it. He did mention that he knew a few who did give their PA1X's up for the PA800.
I know this doesn't help much but trying to figure all of this stuff out is a nightmare. That part is easy to figure out because of all of the swapping of keyboards going on constantly.
I still use my dinosaur Korgi30 and my fans still enjoy my music. I do play many old standards on my Tenor with the help of sequences, which gets a little extra attention.
Boo