Well, what about Revenge of the Sith? You say it's the greatest work of art, in any medium, created in the last 30 years. It’s better than... uh, Matthew Barney or Rachel Whiteread or Chris Ware or Peter Doig?
Yes, the long finale of Revenge of the Sith has more inherent artistic value, emotional power, and global impact than anything by the artists you name.