Buddy,
there are people who love Yamahas, and there are people who hate Yamahas,
there are people who love Kawais, and there are people who hate Kawais,
there are people who love digital, and there are people who hate digital,
It's a preference, and it's also experience through playing them. Sure I've not played a Bösendorfer, but I know a good piano when I hear it.
And regarding the $90 grand for that "grand"...Yeah I was expecting that, time to sell my clothes....or go piano hunting.