The Australian – who still drives for the junior team Toro Rosso – said his real target is to be the best in the sport and believes he is good enough to compete with the German.
He told Formula One's official website: "I believe that I've got this far for a reason - so there is no reason why it should stop here. With each year I get more hungry and determined.
"I see Seb and I know that he is a phenomenal driver - but he is also only human. If I really put the hard work in I should be able to challenge the top guys."