Andrew Luck was drafted to replace a legend. He is part of the reason why the Colts cut that legend. Peyton Manning was due $28 million in 2012, but his neck injury wasn’t guaranteed to be recovered from. So then the Colts let him go and drafted Luck.
Luck has been with the Colts for seven years now. It’s a large enough sample size to compare the two quarterbacks. Both made it to the playoffs. Manning made it 5 of his first 7 years, while Luck has made it in 4 of his first 7.