While I haven't played very much, I've noticed there seems to be slightly more luck in sealed than in draft. In draft, skill can prevail by recognizing bombs/archetypes, observing what colors are available, stealing good cards from your opponents, etc, while in sealed you are just forced to work with what you have; if you are stuck with mediocre rares and no good uncommons that fit with your general color pool, you're probably going to do slightly worse against somebody without these initial disadvantages no matter how skilled you are at deckbuilding.
How much luck is present in the 3 popular limited formats? Which have the most and least luck involved in determining the winner of individual matches and tournaments? In which is it easiest and hardest to win when you are the superior player?
NOTE: by 3 limited formats, I mean booster draft, 6-pack 40-card sealed, and 4-pack 30 card sealed. Feel free to include information on other limited formats if you like but these were the ones I'm most interested in addressing.