A vs Sasuke first round would've resulted in Sasuke's death.
A vs Sasuke, with same conditions as before, without outside interruptions results in Sasuke's death.
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A is not a complete hot head, as Exaar said, during their first encounter A was distraught with Bee's capture and was irrational. A didn't have to loose an arm in their first encounter he was POed, and quite frankly A has perhaps the highest pain threshold of any character, other then his father. If you have ballz enough to cut off your arm and remain with a straight face asking your medic to heal you, then that's saying something.
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Anyway, just because Sasuke thinks doesn't mean he's better then A. The raikage can take a lot of shit, and if he's not hit with a fatal blow (head cut off, stabbed through the heart, etc...) then his ass is going to stay right on top of yours. Same conditions as when they fought before results in A's victory and Sasuke's death IMO.