But because Superman was exposed to our Sun longer than any other Kryptonian, he grew up to possess more powers than other superheroes of his kind. ... Having the codex in his DNA means, he possesses all the superpowers that a Kryptonian can have.

What does the codex do to Superman?

Codex: An ancient Kryptonian artifact that decodes the genetic makeup of the artificially incubated babies on the planet. It translates a child's genetic attributes before his or her birth.

Is Superman stronger than other kryptonians?

As in the comics, Kal-El's powers are depicted as being superior to other Kryptonians, due to his spending a far greater period of time exposed to Earth's yellow sun and atmosphere, though some have an advantage over him in terms of combat experience (e.g. Zod, Faora and Nam-Ek).