What sets ESR apart is his running with the ball. To me he is most like Rosicky but Rosicky was not as good running at pace.
If ESR can add elements to his game through experience and continue to score goals he is going to be a superstar in his own right - unlike any other player we have had. People will be drawing comparisons to him rather than the other way around.
He's developing fast and fingers crossed that is maintained and he stays free of serious injury.