Raheem Sterling: How does his progress compare to Messi, Ronaldo, Rooney?

Raheem Sterling has become the most expensive English player of all time, after joining Manchester City from Liverpool in a £49m deal at the age of 20.

How has his career to date compared with the world's top players, Lionel Messi and Cristiano Ronaldo, and England captain Wayne Rooney? And what targets of theirs can he hope to emulate?

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