Scot is right - it is difficult to compare World Champions across the 60 years since F1 started. The skill mix required today is subtly different from the earlier decades, although intelligence, coordination and courage have always been required.
Today's drivers often start in the Junior leagues before they are even in their teens whilst '50s champions often started in their thirties and raced into their fifties.
You can't just compare the number of wins to starts, or even wins, seconds and thirds to starts. You have to look at the competition and the quality of the car/team. Some multiple World Champions have had their wins in dominant cars/teams - like Mercedes at present. This is an interesting Model:
https://f1metrics.wordpress.com/2014...est-f1-driver/