Another devoted Sin City fan! I don't know why but I could have sworn you were a Batman buff, LLC. Batman's my favorite super hero and all but when coming down to movies, I'd take Sin City over anything any day of the week. In fact, I'd say the greatest comic book movies are:

1) Sin City
2) Superman II
3) Spider-Man
4) X2
5) Batman

You can go down from there but I wouldn't even consider Batman Begins to be in the Top 5.