They should also be able to make 1.6x sensors at least on par with those found in Nikon, but apparently they can't.
Nikon Crop sensors are slightly larger. Canon APS-C is 1.6x crop, Nikon APS-C is 1.5x crop. So for camera bodies with the same resolution the Nikon should be able to offer slightly better IQ.
Eos: 1Ds-III, 5D-III, 6D, 60D | Canon EF: TSE-24L-II, 16-35L-II, 24L-II, 35L, 40STM, 100f/2.8, 135L | Wishlist: TSE-17L, 200f/2L
Tamron: 24-70VC, 70-200VC, 150-600VC | Samyang: 8mm-T3.8, 14mm-T3.1
Crazy Ideas: TSE-90L-II, 40f/1, 100f/1.4, 35-85f/2, 100-300f/4_1.4xInt, 500f/5.6_1.4xInt