Capture Integration did a quick side by side, Live View comparison between the Hasselblad and Phase One 50MP Digital Backs. From the video below, it appears Phase One has the advantage. Of particular interest is Phase One's superior refresh arte, dynamic range and contrast.
My readers know after much deliberation, I have finally replaced my venerable EOS-1Ds Mark III with the full frame, 61-point AF, 50 megapixel Canon EOS-5Ds camera. The 5Ds will be used primarily for nature and travel photography but also for wildlife when the animals don't move too much. The resolution of its impressive sensor, the ability to crop the image to 1.3x and 1.6x right in the camera are great advantages for me when it comes to wildlife photography, offsetting its main disadvantage - the slow 5 fps burst rate. I will be taking this camera on many worldwide photo shoots in 2016 and writing a comprehensive review on it in the next few months. You can see my equipment bag and works on MichaelDanielHo.com