FWIW, Yamahas FSX isn't even close to the action on the PA2X imo (and I suspect Korg will use the same as the PA2 on the PA3).
And in case anyone wonders, yes I owned a Motif XS for some time, so I have real hands-on experience so to speak

The keys are shorter on the FSX,(and whilst I did not measure they also felt a little narrower)and the throw is noticeably shorter.
The FSX is a nice enough keybed to play, but it's quite a way below the Korg.
Dennis