The situation: You are playing a deep stack tournament with 300BB starting stack. Let's suppose you have exactly 300% ROI in this field, in this specific tournament. UTG goes all-in on the first hand, everybody folds until you in the BB, you look at your hand and see Aces. Let's suppose you have exactly 80% equity against his range (to ease the calculation).
Is it worth it to call or the fold get you more EV in the long run? What is the ROI limit when you should definitely fold this hand?
What's with the same situation, when the player goes all-in and accidentally shows his hand (but not dead) QJs and you got AKs (everything is the same, except you have 60% equity) ?