Daddy JJ,
You are absolutely right--it is very subjective. Having listened to dozens of pianos from various manufacturers, they too have vast differences in sound. With a keyboard, if the sound it produces is not the same, full, rich sound that comes from the mid range of a grand piano, then to me, that keyboard is not worth owning.
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)