yes you are right, if I want a video camera, but for now I love to take stills
IMHO there is an improvement at high ISO with the 6D / 5D3 over the 5D2, and an edge over competitors like the D600. DxO may disagree, but when I look at DPReview and Imaging Resource test shots, that's what I see.
Likewise my EOS M is better at high ISO then my 7D. Not by leaps and bounds, but there was some improvement.
Critiques portray Canon as standing still with antiquated sensor tech. They will point at the 18 MP APS-C line and say "look how old that is!" ignoring that each iteration brings some improvement. They're looking for a radical improvement in shadow noise (see the Sony patent) or MP, and ignoring small improvements over time.
Critiques also rely on DxO measurements which I find questionable. For example, DxO will tell you there was no DR improvement from the 10D/20D to the 7D. I owned all 3 and I noticed a significant DR improvement with the 7D.
Canon's moving forward in still photography sensor tech, just not at the pace some people want.
Agreed, for the most part. I think the lack of any kind of significant revolutionary leap in favor of very small evolutionary improvements will hurt Canon in the long run, when more revolutionary leaps are what the competition has been doing.
As for DXO, I wouldn't call ALL of their measurements questionable. Of all their measurements, the only one I truly find questionable is Print DR. I understand the need to normalize image size for cross-camera comparisons, but I find the notion that you can gain photographic DR (and stops of it, at that!) simply by downsampling to be extremely suspect. I believe the very vast majority of photographers who care about DR are editing in RAW...and the simple fact of the matter is...you don't scale raw. You ALWAYS edit RAW at full size, so any additional DR would come from the Screen DR measurement.
The worst thing from DXO is their linear, scalar "score". I find scores for such complex devices to be useless, misleading, and in many cases with DXO (i.e. lens reviews), just flat out wrong.