So Sentry and Hulk would own Thor. I seem to recall Thor breaking Sentey's neck, then later when he was even more powerful, owning him with a bolt. Oh and Thor has lost to Hulk but that's because he's never gone at Hulk with the intent to kill whereas the latter is always enraged. When he was serious he smacked Hulk once and almost killed him. The creator of both characters Stan Lee said that the reason he created Thor was to have someone more powerful than Hulk among Earth's heroes.