The Calibre Of Ace-King...? (Suited or Unsuited)

Now this is probably a still a big debate in poker today... well it is. But I want to look at Ace-King from a different prespective.

In tournament play, against an all-in bet say, is it always right to call with A-K (suited or not) if you know your NOT up against wired kings or aces? Because the argument is, if you're not your always getting about a coin-flip, and in some cases you will be dominating lower aces or kings.

Your thoughts please? And would your answer change for a multi-table tournament, as to a single-table tournament? And would the size of chips in both yours and your opponents posession be relevant, plus the stage of the tournament, and the blinds etc...

Regards,

The Prawn