...I hope the creator of that piece of art didn't intend to do a perfect comparison, otherwise this would result in "Aang, you kissed your sister!" "Yuck!" "It's okay, I'm in love with Sokka anyway." "But... you're his ACTUAL sister!" "Script says I have to..."
Aang and Luke compare better than Aang and Han though, that's for sure. Sokka and Han also compare very well. It's just the rest of the relationships here dun fit (Appa and Sokka? Nehhh!).
[/jokekiller]
I'll take that bet, and raise you on jillion dollars!
Of course, I am betting that it will get 100 replies (and then more).