Dialog is something I have an uneasy relationship with as a measure of quality - I've seen some pretty excrebile horror films that nonetheless had punchy dialog; obviously Quentin Tarantino and Kevin Smith have made a careers out of zingy dialog, but to varying degrees of story relevance... overall, I tend to view good dialog as a very welcome frosting, but I still demand the cake, you know?

I'm trying to think of what I'd call examples of really good comics dialog, and they are rare - in general, it seems to be a medium more tooled to emotions and ideas and extreme information compression, which can lead to some very silly and contorted dialog. (I have real fondness for early Stan Lee-speak, but it's by no stretch of the imagination "naturalistic.") Brit comics like Judge Dredd have an ear for zingers and my onw personal favorite strip, Modesty Blaise, has a very distinctive style, but neither of those really count as current titles.