Selected YouTube Piano Videos Piano Pages   William Wieland
I searched YouTube for videos that captured great piano technique and found the following:
Barenboim discusses the work with Lang Lang—one amazing piano lesson!

Zimerman plays Schubert's Impromptu Op. 90 No. 1
Zimerman plays Schubert's Impromptu Op. 90 No. 2
Zimerman plays Schubert's Impromptu Op. 90 No. 3
Zimerman plays Schubert's Impromptu Op. 90 No. 4
Interesting tidbit—They all play Steinway & Sons pianos.
For more names of great pianists, google Great Pianists of the 20th Century. It was a 200 CD box set featuring 74 pianists of the 20th century released by Philips Records in 1999 and sponsored by Steinway & Sons.