nothing to contribute as gd find,
but this 60mins on Schnabel was what I just happened to be watching just now, and how much fun it could be if I know how much Julian Schnabel hate Robert Hughes and raised similar question when he was in town.
http://www.cbsnews.com/video/watch/?id=4653135n

Are critics always negative person? I must admit I love the writings and artistic judgement of Hughes, love not Schnabel's plate paintings, but most of his drawing quality paintings, despite I think they are rather "too easy" (as Schnabel comment on 60mins quoting Hughes), and wasteful too!