It boasts the highest resolution sensor currently available in a 35 mm full frame DSLR at 50.6 megapixels. Video features are limited when compared to the 5D Mark III but it includes state of the art technology regarding still photography that make it highly competitive at $3,700, for body only. It comes in 2 variations. The 5DS R doesn’t include the low pass filter designed to reduce noise and moire patterns but has the side effect of reducing overall sharpness and detail.
Take a look at the incredible resolution in these sample images.
It will require the highest quality lenses to get the full benefit of the higher resolution sensor.
More details and full specs available here @ canon.com