Guys, first of all, pocket pairs vs overcards is NOT a coin flip match. Most of the time pocket pair have advantage of 1 to 5% pre flop. Just use your favorite tool to simulate and take your conclusions.
This is a HUGE advantage, for example in cash games, over some 100s K hands. Just do the maths, how much it will cost.
I deal with quantitative models and Im used to consider diferences up to 0.001%. When I hear poker players talking about coin flips when one player has 1 to 5% advantage over the other player, it makes me laugh, all due respect.
I respect the fact that some guys may have some sort of fetish for overcards, just realize that pre flop this is minus EV. Even pocket deuces has tiny advantage over AKs.
Just do the maths