"It was great to win last year but to repeat is even greater this year so I'm very happy especially with this year's championship being very tight," the 25-year-old told reporters after his 23rd career victory.
"We didn't have the fastest package this weekend but still we won the race so I'm very happy."
The victory helped Vettel cut the deficit on championship leader Fernando Alonso to 29 points after the Spaniard steered his Ferrari around the street circuit for third.
Podium for AlonsoAlonso was delighted with the podium finish as he once again demonstrated his ability to score points with an inferior car - something Vettel was keen to replicate over the final six races of the season.
"It looks better than before, Fernando finished third I'm not a genius but it is looking 10 points better than it did before, so there are a lot of races left," the German said.
"We have to make sure we finish the races first of all. I think the pace is there, even if we are not quick enough to win, it is good enough to collect a lot of points and we have to make sure we do that.
"It is a tough championship so far but we are still in it and still looking forward to the next couple of races and obviously the target is to beat Fernando."