Am sure some sandy vaginas will emerge and moan whenever I mention Batman defeating anyone WITH PREP TIME, yet I stumbled upon this interesting response by an editor of DC Comics in a thread that asked who would win if "The Big 7" were unleashed on each other. The Big 7 being Aquaman, Batman, Superman, Wonderman, Flash, Martian Manhunter, Green Lantern. I also once commented that Wonder Woman was right behind Superman in strength. It is mentioned here again (for anyone interested).
"Superman has killed too, mind you. Not just Diana and Arthur.
Unless they are near water, I see Aquaman going down first. Sorry Orin.
Flash is next....superspeed can't stand up to mental assaults from J'onn.
Kyle may have the most powerful weapon in the universe, but Wonder Woman, Superman, J'onn, and Batman all coming at him at once? Sorry Kyle.
By the way, Superman is stronger than Wonder Woman. She is second to him in terms of strength. Him and J'onn go at her at once and she goes down. Plus as someone pointed out she is vulnerable to mental attacks.
Supes and J'onn are the same strength level, plus J'onn has telepathy and molecular manipulation. Superman goes down.
Now it's a toss up between J'onn and Batman. J'onn has all the power, but Batman has all those brains plus those nifty gadgets. We've seen Bats take down the entire JLA by himself. In the end, with prep time, Batman. Without prep time, Manhunter."