Iron Man and Dr. Doom has faced off in the past, but that was before Iron man had his multiple upgrades and before he had extremis. That was also before Dr. Doom had his multiple upgrades and had a larger mastery of sorcery.
If Iron Man and Dr. Doom now had a fight, with about half a day of preparation, who would win?
Of what consequence are you now? These people, this world, they are nothing - the universe is power, pure unstoppable power - and I am that force, I am that power.