I think I know what you're saying. I have a Korg Kronos which sounds much better than the Audya for voice sounds (there is a noticeable difference).

The Kronos is similar to the Yamaha Montage, and they may have used some of the same technology in the Genos.

For arranger/live band sounds the Ketron is hard to beat. Just wish they would improve in some of the other areas.