Hi,
It just may be that extreme DR is not the crucial factor in image making. Just as an example, Velvia film had quite horrible DR but it was a favorite of many landscape photographers, including myself.
So, it may be that Canon systems lag in one aspect, DR, but they may have other advantages.
Just to say, the 5DIV and the 1DXII have new sensor technology, on sensor column converters, although they still lag Sony sensors in DR. Technology doesn't stand still at Canon...
Best regards
Erik
think Adobe - they don't need the best ever demosaick, NR, color, DAM in the world ... but they have the best (= biggest) market share among the paying customers regardless ... so Canon just needs to get its gear to get the job done and the gap (sensor "DR" wise) is actually decreasing, so Canon is not sitting idle - they simply mind their costs vs sales