Card Percentages

[springb0ks]

I hear a lot of people talk about coin flips and so forth. And i understand the fact that two over cards vs an under-pair is a coin flip situation. However, a lot of people after tournaments, say things like: "I lost a lot of 70/30's, and that hurt my stack, and then i was out". Now my question is, do these people calculate that they are 70/30 over their opponent during a showdown when they see the cards? Do they do this calculation in their head, and figure they are a 70/30 favourite to take down the hand, or do most poker players have all the popular hand comparisons memorized which they can use at the table through hours and hours of playing?