It's been five years since Guerrilla released the original Killzone on PS2. Five years, one console generation, and seven PPEs later, Guerrilla crafted what remains one of the best looking games to date: Killzone 2. In its retrospective piece, Guerrilla compares how the tech and characters have changed in the five years spanning the two console games. Perhaps most surprising about the comparison is not how improved the PS3 game is -- rather, we're impressed at how well the PS2 game has stood the test of time. Perhaps it's time to revisit the PS2 original, for those of you lucky enough to own a backwards-compatible PS3.