Canon's top-of-the-line DSLR replaces both the 1D Mark IV and 1Ds Mark III in one fell swoop. With a new full frame 18 megapixel sensor, the 1D X has the resolution to please studio shooters and the frame rate, at 14 fps, to appeal to sports photographers and photojournalists. Expect incredibly clean ISOs in even the lowest light conditions. And as with the D4, the 1D X adds a host of video features along with a mic input for those increasingly focused on both video and stills. Interestingly, there's no high-speed XQD slot included and the price sits around $6750, a full $750 more than the D4. Still, testing is beginning to show that Canon's newest autofocus has leapfrogged Nikon's and put this camera in the lead.