Nikon's newest top-of-the-line DSLR offers numerous upgrades to 2009's D3s and competes with Canon's 1DX. The processor and autofocus system have received a boost and the full-frame sensor has been upped to 16 megapixels. Nikon is aiming the camera squarely at photojournalists and wedding photographers who need the high ISO capability of a less-dense sensor. Those looking for more resolution will want to check out the very good D800. Nikon has also jumped head first into the video arena, with the D4 supporting multiple frame rates at 1080p. The back LCD has also been expanded to 3.2 inches for better video playback. Tests show that the D4 isn't better than the D3s at high ISOs, but retains a tad more detail due to its higher megapixel count. The one niggle is the use of XQD cards, which are extremely pricy compared to compact flash and don't seem necessary. If you want to use two cards, though, you're forced to buy into the new technology.