We saw the Vermeer exhibit in DC some years back. The pictures are so much more beautiful in real life that we didn't even bother to buy the book. There was almost no comparison.
Another artist that surprised me because he was so much better in the original was George Catlin, the Indian portraitist. We saw the exhibit of his paintings in the little museum catty-corner from the White House.
This one was never finished, but it just jumps off the wall at you.