Bill, I played the T2 and the G70...they were pretty close...I found both too light for piano, but workable for arranger stuff.
I did think the Tyros2 had the edge in playability, but that's a subjective thing.
Personally I prefer the S900's keyboard...very light and fast.
As far as Korg using Fatar? Maybe you're right...anything is possible these days.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.