Nice that you had a chance to play a top quaility instrument. Nothing like the touch and the sound resonating around you can compare in the digital world. But it does give a good referance point when choosing a digital. And for performing there are fewer and fewer opprotunites to play a gig on a quality piano.
The closest to a Grand I had was a 54" Kawai Studio, my first new piano. Loved it but when we moved it had to go and I was lucky to find it a good home at a local College.
My Roland FP90 gives me a close approximation so I'm happy I found it for a replacment of the real thing.