Annoyed that Button couldn't shoot ahead of Hamilton. He must have had a mistake. I don't know if anyone else caught it, but at one point in his final flying lap, he was 4 tenths up on Hamilton's lap.
I don't remember at what point he was up on Hamilton, but it was the middle sector where Lewis hasn't been fastest. So, if it was at the end of sector two that Button was faster, the difference might have come from the final sector, as Lewis was fastest in sectors one and three, at least as of near the end of the day.
Regardless, I'm not surprised by Hamilton outqualifying Button. Lewis typically does. Looking at the qualifying spots from 2011:
Australia - Lewis 2, Jenson 4
Malaysia - Lewis 2, Jenson 4
China - Jenson 2, Lewis 3
Turkey - Lewis 4, Jenson 6
Spain - Lewis 3, Jenson 5
Monaco - Jenson 2, Lewis 9
Canada - Lewis 5, Jenson 7
Europe - Lewis 3, Jenson 6
Britain - Lewis 5, Jenson 10
Germany - Lewis 2, Jenson 7
Hungary - Lewis 2, Jenson 3
Belgium - Lewis 2, Jenson 13
Italy - Lewis 2, Jenson 3
Singapore - Jenson 3, Lewis 4
Japan - Jenson 2, Lewis 3
Korea - Lewis 1, Jenson 3
India - Lewis 2, Jenson 5
Abu Dhabi - Lewis 2, Jenson 3
Brazil - Jenson 3, Lewis 4
Lewis outqualified Jenson for fourteen out of nineteen races, or 74% of them. There's really not much supporting expectations of Button outqualifying Lewis on any given race weekend, at least statistically speaking.