I have been in the trenches with digital pianos since I bought my first Ensoniq Mirage in, I think, 1986. It featured a whopping FOUR SECONDS of memory and had some screwy little 8-bit floating point sampling scheme. It was kind of awful, but Mitch Forman sure played the crap out of it! Things evolved; in the '90s I played the Emu Proformance piano module, which was actually really great for what it was: a 2 megabyte (approximately 12 seconds of stereo samples, I think) module that played pretty well. Then came the Gigapiano, this giant 650 meg piano sample in Gigastudio, the big PC-based sampler; couldn't play jazz on it but boy did it sound like a Thomas Newman score with the sustain pedal down.
I was never a fan of the Ivory pianos until they released the Italian Grand; I heard it at the NAMM show and bought it on the spot.
Original Content: Best Digital Piano Sound