I'm interested in this idea that a piano has a distinct timbre per note. Surely the most distinct thing between two notes is their pitch. But you're saying people pick up on the harmonic signature more readily? I can here the difference in timbre across different sections of the piano, but I really cannot imagine distinguishing the timbre of two consecutive notes within the same "section" (by section I mean that the strings are arranged equivalently except for length and tension).
I'd also think that those people would be very sensitive to the make of piano.
I'd also think that those people would be very sensitive to the make of piano.