Read noise and fixed patter noise can easily been level out / removed with black frames,..
true, but that's more PP work than I want, or any of us should have, to do to get a decent low ISO image
There are also banding where the read out levels are uneven calibrated to the ADC , like the problem with the first 7d.
Sold my 7D because of that, tired of those 8 pixel wide strips in the shadows because the dual readout channels were not properly matched
If Canon would they can limit the read-out noise, others with the same type of readout and signal path to the ADC can do it. ..
That's what I'm thinking. There are other sensor systems out there that are made more like Canon's than Sony's and they still perform better than Canon. Obviously the technology exists for Canon to improve their read noise, and their read noise variation, even without spending a lot on developing a sensor as good as Sony's, etc.
The 6D is the best for reduced low ISO pattern noise I've seen since the 50D came out. Their earlier cameras did not seem to suffer from FPN nearly as much. Seems that when they added video capability, that's when things started to go sour. Even the live-view capable 40D and 400D didn't have the FPN isssues as bad as later models like the 7D, 5D2, etc.