Christopher Nolan believes that it was harder to create the world of Superman than it was to create the world of Batman.
Nolan is taking on producing duties for Man of Steel, which is released this summer, and he has nothing but praise for director Zack Snyder.
Nolan says that Snyder faced a very difficult task and the post production process was a long one.
Speaking to the Hollywood Reporter the director said: "Zack was the perfect man to take this on.
"He is unbelievably skilled at creating a coherent, cohesive world - whether it's a very stylised world, like 300, or something that's more challenging, more varied, like he did with Watchmen."
"In my honest appraisal, taking on Superman and creating that world is far more difficult than creating the world of the Dark Knight.
"He has a lot of finishing to do on the movie - it has a very long post-production schedule because, unlike Batman, Superman flies.
"I actually feel guilty talking about it because I'm sitting here having nothing to do to it."
Henry Cavill is taking on the role of Superman in the movie while Amy Adams and Russell Crowe are also on the cast list.
It has been a great year for Nolan as he helmed The Dark Knight Rises to a billion dollar box office success.
Man of Steel is released 14th June.
Tagged in Christopher Nolan Zack Snyder Superman