I'd hardly expect a Canon company guy to come out and say their sensors are not the best out there.
I don't think there are any complaints for high ISO performance (there isn't a lot of difference between the makers here)
Dynamic range hands on real world no Canon's DR isn't as good as other makers and that included full frame bodies as well as APS-C
In fact their FF bodies have worse DR than a crop body camera with a Sony/Toshiba sensor
Doesn't seem to have dented their market share though maybe it's a non issue for most