I own both the Yamaha Tyros and PSR2000, and have compared the vocal harmonizers 'side by side' and definitely hear a substantial improvement in the Tyros vocal harmonizer over the PSR2000's harmonizer. It is evident (to me) that each of the individual backup harmony voices is more distinct and clearly heard and that the overall harmonizer sound is smoother (richer). I find the Tyros vocal harmonizer sound quality similar to the Digitech Vocalist Workstation EX, which I also own.

Scott