Interesting tests by DXO. Canon seems to be trailing far behind competition – Nikon d810 and and the new Sony A7R.

http://www.dxomark.com/Reviews/Canon-5DS-5DS-R-Review-New-top-ranking-Canon-EOS-sensor/Canon-5DS-5DS-R-Comparison-3-EOS-5DS-vs-Nikon-D810-vs-Sony-A7R