unfocused (and dmadden), I'm going to third that opinion. for example, I know that the 5D Mark II's AF setup and speed is nothing to write home about, but at the same time, I rarely run across any situation where it lets me down and denies me a shot I could have snagged otherwise (and I shoot everything from low light to daylight, landscapes to BIF).
I do think it's worth noting the 'why don't I switch' sentiment has some merit for a novice who maybe has a single, older Rebel body and kit or middling EF-S glass. there's no reason not to ditch that and move to Nikon if they feel the grass is really greener. I personally think it would be bizarre to see someone ditching 10K worth of canon glass to move to nikon, but if you are that person, please let me know.
what I think the more long-time shooters here know (especially guys who have shot both Canon and Nikon systems before) is that there really isn't a huge difference between the systems at this point, the difference is in the photog