Hm....quite a few candidates as usual!
Alonso, the car isn't great in qualifying, so 5th is usually the best he could achieve, was great in the first two stints with the softs on, he also pulled the best overtake in the race, and one of the best in the season, 4th is the best he could have mustered.
Di Resta, he was moaning about being 3kph constantly after qualifying and the race, even though they did not know why. He was on a 2 stop strategy and did well to get into the points, he also had KERS issues near the end, and I also think gearbox problems too.
Petrov, qualified low down the field, mainly due to setup issues. Had a great start though from I think from 17th to 9th in lap one, the Force India's though seemed quicker, so not surprised he finished in 10th, even then good performance from him and a great way to bounce back after a bad qualifying.
Sutil, he was great all weekend! Qualified 8th, beat his team-mate. Had a great race and finished ahead of Rosberg in 6th. He's been doing really well in the second half of the season compared to di Resta, also seems to have won Eddie Jordan over!
Vettel, got pole (as usual), had a great start and was pulling away until the problems hit! Drove with wet settings to help the gearbox problems, yet still had good pace. Managed the problem well, however I do think he let Webber by too easily, would have liked him to say "naw! If he wants tae pass me then he has tae dae it tha hard way!".
I will give it to the German who runs in a funny way, if you are wondering what I am talking about, then head off to youtube and type in, "Sutil gay run", trust me, it's worth it!