Superman is not as innately cool as Batman.

What Christopher Nolan and I have done with 'Superman' is try to bring the same naturalistic approach that we adopted for the 'Batman' trilogy. We always had a naturalistic approach; we want our stories to be rooted in reality, like they could happen in the same world we live in.

I will say that adapting a character like Da Vinci really wasn't that dissimilar from doing Batman or Superman. Because all three of these guys are really iconic figures, and yes, Da Vinci was historical, but there's clearly been a lot of mythmaking about him, and a lot of things have been attributed to him that may or may not have happened.

I think Wonder Woman is a very difficult character to crack. More difficult than Superman, who is also more difficult than Batman. Also, a lot of people in Hollywood believe that it's hard to do a big action movie with a female lead. I happen to disagree with that.

There's been a long lineage of a stranger in a strange land, whether it's 'E.T.,' 'Starman,' or other movies about trying to connect with humanity; it struck me that's what a Superman story really is.

People have a very proprietary relationship with Superman. It's important to respect the iconography and the canon, but at the same time, you have to tell a story. Once you land on who you think the character is and what his conflicts are, you have to let that lead you.