Recently DC Comics have published tales of humans having Kryptonian like powers in another planetary environment such as Zurenarrh in Batman#113.
Batman finds himself on another planet through a teleportation rip in the fabric of Space and time and gradually gains superpowers through the planet's atmosphere.
Batman's powers are a result of his exposure to an element called Rodon in Zurenatth's planetary environment.
Batman suceeds in defeating that planet's Arch-villain Rohtul at the resolution of the story and Green Arrow arrives at the scene gaining the same superman like powers in the planet's atmosphere
These powers include:
This element is not only found in Zurenarrh's atmospshere but also billions of other planets in D.C's Universe as it affects the physiology of all Earth-men granting them god-like status as long as they are exposed to its radiation.
Now humans could evidently be on par with or even stronger than Kryptonians on other extra-terrestrial planets.