PEOPEL!!!! the arranger keyboards should not be compared only on the basis of how they sound.
If you want the best sound, then you shouldn't even consider an arranger keyboard or a synth. Get a sampler, AKAI or EMU.

Arranger keyboards have lot of other criterias to be considered.
PA-80 should be compared to PSR-9000, not the 9000Pro.

PA-80 wins overall on the raw sounds, but it loses to PSR-9000 on flexibility of mixing sound in an arrangement (Effects, EQ etc...)

Vocal harmonizer wins in PSR-9000

Ease and speed of use .. PSR-9000 wins. In a live situation, you don't want to mess with menus...