Jamie XX is a producer who also plays DJ sets. He's definitely an artist in regard to producing (see the youtube videos I posted), and his DJ sets are already almost legendary in terms of DJ sets.
A good DJ has musical tastes beyond the current trends and pushes people forward in to what music they will like soon. I have immense respect for someone like Jamie XX or SBTRKT or Bonobo when they play DJ sets, because they influence my musical tastes more than anything these days. I'm sure you folks have gathered that I'm a huge electronic music fan so I'm clearly biased, but when someone knows music so well that they can actually progress my musical tastes to something new and meaningful to me, it doesn't get much better than that.
Not all DJ's are artists, but some of them definitely are.