Ian, I feel I can make the comparison as I have owned and played both. As well as a Tyros 2, which I also believe had the FSX.

The throw is shorter on the FSX, the keys are shorter, and the FSX does NOT have weights on the keys, the Korg PA keybeds do.

I agree the narrowness of the keys on the FSX is only marginal, perhaps half a mill??? But it is noticeable, probably more as a "perception/feel" sort of thing, but it does affect.

And I am both a Korg AND a Yamaha devotee... I just cannot afford to have both

Please do not misunderstand me, the FSX action is very very good, just the Korg is better. And it just shades the Roland g70, with the G70 being a tad "lighter" in feel.

Dennis

PS: 100% agree, the ONLY way is to physically play them. If it was JUST only about orchestral voices, the Yammies win hands down