You guys are funny. Superman has no way of actually hurting the Sentry. Sentry on the other hand would hurt Superman. You guys call for OWAW. That means we should use Sentry at his best to date combat showing, which would be Bob in his Death Seed or awakened form. Superman isn't going to sing him out of existance, because he doesn't exist. We see that no physical force would work on him. Anyway, shitstorm away on it.
I'm a Superman fan, he's in my top 5. Sentry is in my top 20.