You can't create warmth where there isn't any without taking brilliance away from where you DO want it.

I'm afraid, in basic terms, the piano sound is either good at virtually the naked sample level, or it isn't. You can't EQ a bad real piano into a good one.

My primary problem I have had with almost ALL Yamaha digital pianos (including some very high end CVP's. etc.) is that the center section lacks warmth at low velocities. Hammer the snot out of them, and they sound great... but play pp passages, or ppp, and I get the impression that rather than listening to a piano right in front of me, played lightly, I am listening to a piano played harder than that, but pushed back a few feet. The tone doesn't 'sing', it decays too quickly at those low velocities.

I regularly play a well maintained, fairly new Yamaha CIIIF at the studio, so I am trying to be fair and balanced, here. Pounded, yes, it cuts like a knife, and works wonderfully well for pop and rock, but back off, and a warmth I never hear from Yamaha's sampled stuff comes out, a delicious blanket of musical glue, that helps tie quiet and loud sections together.

Sampling a piano is possibly the hardest thing to get right. I am surprised that Yamaha, who make some of the finest real pianos, have a problem capturing it adequately.