It's a tough one. They are more similar than I expected. Via headphones I prefer the Nord. Kronos is quite good, but is this the Japanese Grand? Guess I like its softer German Grand more. I also like the VR-09, except one high clinging noise that seems to be in the sample of one key (I think high c). The Fantom one is interesting, sounds a bit like an old upright, nice for a change, too. The Tyros seems to have some kind of stereo chorus effect that sounds a little 'processed' to me. And the PA-900 is better than expected, just the hammer sounds when playing fortissimo are missing compared to the others.
Generally, all the examples are played to much in the forte/fortissimo range for my taste. You would have to hammer constantly on a real piano to get this aggressive level, this makes it a bit artificial, but keyboarders have more and more got used to this sound (maybe in the constant fight with drummers and e-guitarits).