Nikon's latest flagship body, the D4s, gets an updated 16 megapixel full-frame sensor, Expeed 4-level processing, 1080/60p video recording and can now autofocus at up to 11fps. Beyond that it boasts a laundry list of small (but potentially meaningful) improvements over its predecessor. After spending some brief time with the camera, we've prepared some first impressions of the pro-level body. For a detailed analysis of what's new in Nikon's top-of-the-line, take a look at our first impressions review.