User blog comment:Blackendedsoul/Mihawk's Strength/@comment-4182408-20110723110444/@comment-3242083-20110723120856

Look who also shared a friendly competition with Shanks.

http://images2.wikia.nocookie.net/__cb20090125225631/onepiece/images/thumb/8/88/Buggy-_shanks.png/200px-Buggy-_shanks.png

People evolve differently, and Mihawks growth stopped at some point, while Shanks became a Yonko.