Don't even get me started on my 70-200 Canon - can't focus to save its life and has been doing odd things for a while now. Sadly, needs a trip back to Canon home for repairs/adjustments (backfocus with the mark IIn I'd say). I personally doubt that the average person would see any difference between the EF/Nikkor lenses to be honest, let alone @ 100%.
I have my problems with Canon (long standing) as a company, and their only grace is the fact that I'd lose a fair bit of money by switching to Nikon.
BTW, I went to Currumbin wildlife sanctuary yesterday and there was a sea of Nikons. The only other Canon I saw was used by one of the CWS staff. The rest were Nikon DSLRs, one Sony. That's about 20 to one ;-) (yes, it was that marked a difference in numbers). Shots from my mates D90 were far better than my Mark IIn focus wise (on the raptors). And that said, he was using the cheap 55-200 Nikon kit lens, not reknowned for having snappy focus. I was not impressed to say the least.
Dave
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