If he and Nolan Ryan aren’t the top two of all time, the top two spots are vacant.
http://framework.latimes.com/2014/03/05/holdouts-koufax-and-drysdale-on-movie-set/
http://m.mlb.com/news/article/68068528/sandy-koufax-hit-with-batted-ball-at-dodgers-spring-training
My top two: Dizzy Dean and Steve Carlton--but I wouldn't argue with a quartet with Koufax and Ryan. Among today's pitchers, the only ones I think come close are Scherzer, Strasburg, Sale, and Price--and all four are young enough to get better.