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Those here who simply regurgitate "the camera doesn't matter" miss
the point. Yes, the photographer is the most important factor in
image creation - but equipment can absolutely be the difference in
whether or not you get the shot.
I've regurgitated that one many times myself, and still believe it to be substantially true. And while you make valid points about "game-changers," except for the Canon dominance in auto-focus technology that spanned most of the '90's at least, most of these advances only enjoy a relatively fleeting term on the throne before they are equalled or surpassed by competitors.
If the Nikon D3 is as good at ISO 6400 as is indicated by the poster that came bagged with the latest issue of Digital PhotoPro magazine would indicate, it would truly qualify as a game changer. But unless Canon falls behind and stays behind for a number of years, I will not even begin to consider a switch.
And money is only the secondary consideration, even though I would be talking about, at minumum, 20,000 frogskins to acquire a new, comparable array of Nikon equipment. The big hang-up to me would be focusing direction.
My switch from Nikon to Canon back in about 1991 (which I regret not one bit) did lead to at least 3 months of abject frustration while I learned to focus "backwards." My brain's autofocus system had been turned on it's head and had to right itself, which cannot happen overnight. I'd say it was six months before I cold follow-focus without THINKING about it.
Since about half my income on any given month is from sports/action assignmnents, I cannot afford to even think about a switch back to Nikon and risk having my performance go in the toilet for several months. (Auto-focus is a very able assistant, but it cannot take over completely. I use it often to "find" the action, but my hand takes over to follow it.)
I've long drooled over Nikon's 200mm f/2.0 lens. Another photographer I know uses their 200mm to 400mm f/4.0 lens extensively, and it is quite impressive as well. I've even thought of pricing one or both of these lenses with one Nikon body to use it on. Canon currently has no equivalents for either, though they are "working on" the 200mm 2.0. Conversely, Nikon does not have a 135mm f/2.0 that does not have additional funky optics (defocus control) that jack up the price and weight.
But such "mix and match" approach would only work if I could reverse the focus direction, either through a custom function or through a (hopefully reversible) modification to the lens. This would seem to be possible on lenses with which even manual focus is electronic, but I find no camera manufacturer or service person who offers this service.
The "Nikon v. Canon" debate is for the pro-sumers, who just buy one camera and one or two relatively inexpensive lenses and may replace the whole lot after 3 or 4 years, possibly with a competing brand. If you WORK with this equipment and have a much larger investment in gear, you are pretty much locked in, at least financially, and in my case with focus direction, functionally. If Nikon would offer reversible focus direction, they would have a chance of selling me some equipment, and it's possible I may, over time, migrate completely to their system. Canon might get some Nikon converts if they offer the same.
But until then, for me at least, it's a deal-breaker.