That is a great film, no doubt. Perhaps surprisingly, though, the George Clooney one comes closer to the original Stanislaw Lem novel. Lem did not like Tarkovsky's version.
Of course, Lem's novel is greater, more profound, and more deeply strange than either of them. By a long shot. Read it. Now. (What are you still doing here?)
Edited to add: and great as it is, Solaris isn't even Lem's best book. Try Fiasco if you want to read something - In the truest sense of that overused word - awesome. It made a very deep impression on me, and I'm not the only one. Towering.