In his discussion, Ken makes the point that most people don't talk in literate, well-crafted sentences, and it's the writer who has the good ear, being able to re-create the more normal patterns of speech who leaps out.
He also mentions several of the best English dialogue writers grew up speaking other languages, and then later singles out several writers whose collections of their work are worth checking out, specifically highlighting the great British playwright Tom Stoppard with a photo. I mention this for a particular and amusing reason. It's worth noting that Tom Stoppard was born in -- the Czech Republic!
You can find Ken's piece directly here.