1/ Canon has ALWAYS been inferior to Nikon in terms of sensor quality. especially DR (I have seen at least 3 professional lab tests including the famous DXO). 2/ Why do so many pros (more than 50% in a recent poll) own Canon bodies?
3/ If Canon does not release a new camera with better DR, I'll switch to Nikon forever.
4/ Canon fanboy of 25 years (FD, EOS, EOS-digital systems + 20 lenses)
1/ No they haven't, they wiped the floor with Nikon sensors for years, now the seesaw is the other way. Heck for years Nikon said there was never any point to a FF sensor!
2/ Because taking the images that put food on the table is abut a lot more (a hell of a lot more) than one sensor metric. The difference in DR pales to insignificance when you need in focus images, for instance, ad Canon AF still beats the pants off Nikon AF, apart from that damn 1D MkIII mess up, which temporarily gave Nikon a sales boost.
3/ Bye, nobody cares, especially Canon. They have bean counters that work out how many people are expected to leave over any feature or non feature, you have been accounted for and ignored.
4/ So what? You don't owe Canon anything and they don't owe you anything. If more DR, or whatever you feel would serve you better by another manufacturer, is critical for your images get something else.