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Quite honestly I disagree! We have seen Nikon, Tamron and Sigma focussing on OS VC and VR lenses, starting with the great 16-35 VR going to the Tamron 24-70 and then the new 70-200VR you have an unmatched quality package combined with the new D800. I also have to admit that Nikon's flash systems have worked great for years now.
IMO Canon is tiptoeing around the best possible package to form their market, like we can see with the double 24-70 proposition or the 5D3 which hasnt a top rated sensor.
The point with Canon is the entire range of lenses. Canon was the first to make a range of excellent f4 L zooms for those of us with lower budgets. Long teles are amazing, tilt-shift are the best available, 50/85 primes are great, macro is great, EF-S lenses are very very good, 135 f2 is great, 85 1.8 and 100 f2 are amazing gems for the price, etc etc. Sure the other companies have some great lenses, likely better than the equivalent Canon version, but they don't match the full range and overall quality of the Canon lens lineup. Canon is also introducing and replacing more lenses over the last few years than any other camera company, they are investing a lot in the lens lineup.