Who is greatest F1 driver ever?

Seven-time world champion Michael Schumacher, quadruple title winner Alain Prost, and contemporary pacesetters Sebastian Vettel and Fernando Alonso were all contenders in CNN's quest to find the greatest Formula One driver of all time.

Source: http://edition.cnn.com/2012/11/23/sport/motorsport/fangio-senna-f1motorsport/index.html?eref=edition

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