Just how good is Sebastian Vettel?

The Formula 1 paddock pays tribute to the achievements of Sebastian Vettel as the Red Bull racer stands on the brink of a fourth successive world championship.

Seven-time world champion Michael Schumacher says he would be "pretty happy" if Vettel were to break his records, while Red Bull motorsport boss Helmut Marko believes we still "haven't seen the best" of the 26-year old.

Vettel won the Indian Grand Prix on Sunday to confirm a fourth straight world championship crown.

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