I tried all three of these. I didn't actually like the action of the Kawai CA91 (it had been widely touted as having the superior action of the three) and felt the sound was inferior to both the Yamaha and the Roland --- I only heard it through the default speakers and not using headphones, which can make a big difference.
I liked the Yamaha quite a lot for both action and sound, thought it sounded better than the Roland, but it cost considerably more than the Roland.
None of these three really compare to a decent grand, IMO --- I didn't used to think so but after playing on one for a while in school I realized the DP isn't a substitute -- the feel *is* different, the variety in sound is not essentially infinite because there's always a limit to the number of samplings a DP has. Better than a crappy (or crappily maintained) upright (my school has a lot of those too) but not as good as a nice grand. A heck of a lot cheaper though
Ended up with the HP 207 and I'm quite happy with it, though eventually I'd love to pair it with a real grand when I can actually practice without headphones at home / have the money to own one.
YMMV and this is all only my opinion, of course. Good luck.