For the record, I got to see Radu Lupu play live for the first time today here at Orchestra Hall. I liberated this disc from my mother at some point before going off to college and I think it is the recording from which a good deal of my subsequent love of Brahms flows. There was no Brahms on the program today however: Lupu played the Schubert Sonata D. 850 (which I don't know well) and Book 1 of Debussy's preludes. There's a reason why this is less often played Schubert, but Lupu brought out many of its joys.
But the Debussy--well that was on another level altogether. Synesthetes in the audience would have been driven to seizures with the wondrous range of colors he was able to draw out of the Preludes. If one could say of the current greats that it is Pollini who is able to make plain the true structure of a piece, or Argerich who finds its true magic, when we speak of the the authentic color in a work we must speak of Lupu. I don't pretend to know a whit about how pianists go about creating such things, but it was a marvel.
And here's a swell example for your listening pleasure: the Intermezzo in B Minor from that Brahms disc.
P.S. I saw Mitsuko Uchida in the lobby. It was pretty kewl.