I've played the PSR8000 even though I have never owned one. I play the PSR2000 professionally. The PSR2000 is a fantastic board.
I am surprised that someone would use the PSR8000 professionally instead of the PSR2000, but I guess it depends on how you use it.
I don't think I could make a living with the PSR8000 the way I do with the PSR2000.
Beakybird