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Technically, the 18mp canon sensor is more demanding than the D800's, which is just a big 16mp aps-c. Higher densisty pixels = more motion blur/propensity to show flaws etc.
Also, the Canon 18mp sensors weren't all alike; the 7D had a very strong AA filter which they eased-off with the 60D and the xxxD models that use it.
The current 20mp sensor in the 7D mk ii would make a 52mp full frame if they were to cut the wafers at that size.Anyway, I stopped counting when they reached 10mp. The 20mp I'm using now seems almost obsurd.
..seriously though, I'd genuinely be interested to hear your findings.
Of course L glass is great, but I can't follow the logic that the sensor "needs" L glass.
It apparently is true for top-notch full frame bodies like Nikon D800 that shows lenses' flaws with brutal honesty, but the 60D is a 4+ year old APS-C camera that is still very forgiving..