To Q or not to Q

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It's not really a question that keeps me up at night, and I'm not terribly sure where I land (though in my thesis I presumed the existence of Q), but I do find it interesting that the two men I can call Doktovater land on complete opposite sides of the debate. Two years ago, Craig A. Evans defended the existence of Q in The Synoptic Problem: Four Views and this year David Wenham's new book From Good News to Gospels: What Did the First Christians Say About Jesus? appears to deny it (according to Long's review).