The EOS 5D Mark IV is a big upgrade for pro photographers invested in the Canon system. It ups the resolution, putting it in the same class with Nikon's D810, while also bettering its closest competitor in frame rate, video capture capabilities, and Live View focus.
30MP full-frame image sensor; Fast 61-point autofocus system; 7fps continuous shooting; Unlimited JPG shooting buffer; Pro-grade build; Dual Pixel AF Live View focus system; 3.2-inch touch screen; Integrated GPS and Wi-Fi; CF and SD card slots
Cropped 4K video; Clean HDMI output is 1080p only; Dual Pixel Raw function slows camera and offers limited benefits; 4K video files are quite large; Omits in-body flash