I've only just got around to seeing Avatar, after I'd read the above article linking it to Firekind. I have to say, it amazed me how many similar, superficial details the film has to the comic, but still manages to be entirely different.
Bascvailly, Avatar was a pile of beautiful, cliched, largely stupid exposition-heavy rubbish. Firekind was beautiful, weird, often confusing, genuinely intelligent, cliched goodness.
And of course, Friekind doesn't feature Avatars in it. But, another strip from the same era DOES - James Cameron plagiarised Mark Millar's Maniac 5!!