The updated autofocus system is fast and accurate, and as usual its continuous focus tracking system seems to work pretty well. (I didn't have the opportunity to test it extensively, however.) That said, the auto-area AF selection is as relatively unintelligent as most of its peers, tending to select the nearest or brightest area in the scene. Although I didn't formally test the Live View (contrast) autofocus speed, in practice it felt surprisingly responsive most of the time, both for stills and video. While it uses Nikon's full-time AF for video, it's not as fast or quiet as Canon's STM contrast-AF implementation; on the other hand, it's probably fast and quiet enough for most uses (though it depends upon the lens), and it doesn't require a whole new set of expensive lenses.