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Maybe if you're looking only at tests done on APS-C. But on full frame, your statement is not accurate at all. The large majority of lens testing sites have shown that the new 70-200L from Canon is the best of its class in full frame. Photozone, dpreview, slrgear, lenstip, and just about every reputable website I can remember. I'm sure there are exceptions, but they would be in the minority.
You may want to check out the sites yourself before you make auc statements. Photozone and lenstip are the only reliable test sites photozone has the Nikon easily beating the canon at all focal lengths and apertures. Lenstip has the canon slightly ahead at f2.8. Dpreview is garbage as far as I'm concerned and the rest results are basically equal. SLR gear same as dpeview no chrys graphs or numbers to compare so basically a wash. Even the digital picture shows these lenses dead even.