Your question cannot be answered with the information currently available.
"More Famous" is too idiomatic to provide an adequate answer without poll data from various areas & age groups, perhaps even from different socio economic groups.
Without any data of this sort there is no way to really determine which person is more widely known to the general populace therefore any answer would really be speculation, opinion and/or conjecture from the individual who answered.
Will Smith was more famous for his music and work back in the 90's. Usain Bolt won gold medals in the 2012 Olympics. It depends what view you look at this. Will Smith was known for Entertainment and Usain was known for Sport.
Because I don't really like sport I would have to say Will Smith, however other people may disagree with this.
Britney Spears is known world wide and has sold 3rd most albums around the world for any female artist
usain bolt is more famous
Usain Bolt he has over 6million dollars now.
He's only broken the 100 m and 200 m but he has broken them numerous times
1968, don't know what month though, think it was in the spring.Led Zeppelin established is like saying Usain Bolt is the fastest human in history, just replace fastest human .
They're both of Jamaican origin which is obviously a similarity, other than that Bob Marley is a famous reggae singer and Usian Bolt is a olympic sprinter.
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