But they have never fought against each other for F1's biggest prize -- Raikkonen departed F1 at the end of 2009, just as Vettel began his series of titles in 2010.
So will the heat of a championship battle in 2013, with Raikkonen already leading Vettel in the world championship, spoil their friendship?
"I think you have to separate the two things," German Vettel told Bild newspaper.
"Anyway, we get along very well, but it's not like we spend every spare minute in the paddock together," he added.
Bild correspondent Frank Schneider wrote: "Raikkonen and Vettel are completely different.
"Raikkonen is tattooed, smokes, drinks, while Vettel lives a disciplined life free of scandal."