Sokolov is far and away the greatest pianist alive, and I hardly consider this a subjective opinion. It hardly matters what you sample him in, you'll hear what I mean. From the Rach 3 (Stockholm is preferable) to the op. 25 Chopin etudes, through to Bach's partita 4 and 6, Petroushka, Tempest sonata, op. 111, WTC, Chopin nocturnes, and whatever else, he's unique. To really experience him though you must see him live--or as a second best what the phenomenal DVD SDL mentioned.
To the lucky person who has his Hammerklavier, you're in possession of one of the finest performances of that work. No one in my experience has clarified the final fugue so marvelously.