Well I was thinking of concert grands of the 7 to 9 foot variety. If you're going to compare they've got to be at least pretty similar. Of the pianos you...Ax & Wz have mentioned, I've not played any Sauter, nor a 9ft Yamaha or Kawai or Faz.
I know what you are both getting at, it's just you adjust your playing to any (new)piano. Yamaha is used by pop and jazz because they can be thumped and bright, but to me they can be played in quite a warm mellow way that sounds quite suitable for classical chopin. They are not to my taste generally but that's not the point. People associate Bechstein with the clarity of Mozart or whatever, yet to me that sound can also be good for the jazz I love.
Slightly off topic but related, it's a shame Steinway has such a stranglehold on the concert scene so we don't hear all the other good brands available. Everyone knows them, is used to playing them, they're reliable. Yet I've played some average new D's and B's. Maybe that is a comment on the dealer preparation.
Did you see the thread over on the pianofacts forum where Geroge K listed pianos he liked, and then gave the same list of pianos as ones for which he'd played some that did not 'grab' him?
It got me thinking in reverse. I like Bosies, etc etc, but there are only two brands of piano for which I can say every new model I've played has 'grabbed' me. Stuart (but I've only played one of each of the two sizes so that may not count) and... Bluthner. From the model C to the 1, I find them all really, really nice for their size. The model 1 and 2 especially of course. Again this might be a comment on the London dealer preparation.
And finally, on action, I try not to let it influence my likes and dislikes, but if I had to list the best actions I've tried, I'd say Stuart, Fazioli, Steinway, Bechstein, Bluthner.
Andy