Originally Posted by J.Drangal
THIS. This is a perfect answer to the thread in my opinion. And this is why, at the end of the film, when Zod takes off his helmet, he shows us his impressive capabilities. He can finally tolerate our atmosphere and we know then that the final battle will be very difficult to win for Superman.
I think that even though Zod started to understand how to use more of his powers, Superman still had the advantage by having had them so long.
As for overall Kryptonian physiology, I don't think much was changed. The sun is still the cause for his powers, & it all pretty much checks out as in the comics save for a few changes made to (as stated earlier) cope with the more realistic nature of the film.