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"More Famous" is too idiomatic for anyone 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.
John Lennon
john lennon
john lennon
John Lennon by far
John Lennon
John Lennon
David Beckham is more famous than John Lennon.
John Lennon
John Lennon's little wang is more famous than Little Wayne.
John Lennon- his music is famous throughout the world and has been for decades, whereas The Incredible Hulk is a 1970s invention of Marvel Comics and, despite being a famous fictional superhero, is not as ingrained into global cultural history or awareness as Lennon is.
John Lennon he was a Beatle so that helps
Both because it is your opinion