I still think The Harry Cannon character was the template for the Bruce Willis taxi driver in The Fifth Element. Of course both are connected by Moebius The Long Tomorrow. I feel the most effective piece is the B-17 segment. It is short but packs more creepiness and atmosphere than most zombie movies do in two hours.
I always thought of Harry Canyon when watching Fifth Element. Like I said elsewhere, at least on the DVD version of Fifth Element that I own, there is a feature about Metal Hurlant magazine and how it inspired Luc Besson.
I think a large part of what helps B-17 is also Bernstein's score.