Nikon D5
If you're looking in the market for a true pro-grade SLR -one with a huge battery, a build that's going to withstand the rigors of daily use, a full-frame image sensor, and a focus system that can keep up with high frame rates-you have two real choices: Canon or Nikon.
Fast 153-point autofocus system; 12fps continuous shooting; Strong high ISO image quality; 20MP full-frame image sensor; Tough, durable build; 3.2-inch touch LCD; Clean HDMI output; 4K video capture; Available with dual XQD or CF slots
4K video is cropped; Underwhelming autofocus for video; No Wi-Fi or GPS; Omits in-body flash