Henry Cavill -- Is George ZimmerMan a SuperMan after Car Rescue??

If anyone knows about what it takes to be a superhero it's Henry Cavill -- Superman himself -- so when he arrived to LAX yesterday, we had to ask about the new life-saver in town ... George Zimmerman.

We asked Henry if it's possible for a guy to be considered a "hero" even after millions of people branded him a villain for life -- but ya gotta listen to the way our photog poses the question, it's incredible.

As we previously reported, cops say GZ helped rescue a family of 4 from an overturned car after the driver lost control on a Florida highway last week ... just days after he was acquitted in the Trayvon Martin case.

There's more ... our photog also asked Henry about the recently announced Superman vs. Batman movie ... and who he thinks would win in a fight between the two.