AnandTech has published some preliminary benchmarks for iPhone 6 and iPhone 6 Plus. As expected, the A8 is fast. What I found interesting is this:
As one can see, it seems that Apple has managed to do something quite incredible with battery life. Normally an 1810 mAh battery with 3.82V nominal voltage would be quite a poor performer, but the iPhone 6 is a step above just about every other Android smartphone on the market.