Apart from the many other differences between the two I'd say one of Bukowski's greatest traits was his honesty, which always comes through to me in his writing. Sheen on the other hand just kids himself he's being honest when he goes on TV and talks about the various ways in which he is 'winning', whilst being in total denial about the impact his lifestyle is having on his kids. I'm not some puritan who thinks you can't have fun when you've had kids but I do think Charlie Sheen is a weapons-grade tool all the same.