2011 as tough as 2012 - Vettel

Sebastian Vettel said that his 2011 championship victory was as hard as his triumph in this year's drivers' title

Source: http://en.espnf1.com/redbull/motorsport/story/97147.html?CMP=OTC-RSS

Gerhard Berger Eric Bernard Enrique Bernoldi Enrico Bertaggia Tony Bettenhausen