Originally posted by DragonLord Canon.
Canon has been about advanced technology, more so than Nikon or any other company. Canon's AF systems are simply light-years away from others, and their lenses tend to incorporate more advanced optics and electronics than Nikon. Canon also offers more lens choices than Nikon, and there's no concern about entry-level bodies not able to autofocus with old AF lenses. The Canon EOS system is a consistent platform that doesn't have the bewildering compatibility problems that Nikon has with entry-level bodies and older lenses such as metering oddities (no metering at all--not even spot metering--with old AI lenses on entry-level bodies!?).
They're all reasons that I don't care for or are blatantly wrong. Advanced technology? Point out one area where canon beats anyone (in photography). Outside of photography, nikon makes the imaging equipment that sony uses to make their sensors. You know that EXMOR one that's making such a splash? Ken Rockwell has tons of information on this area that is also irrelevant to photography. I have no idea what you're on with the AF as they're roughly the same now that the 5D2 has been surpassed. Before that, D700's autofocus>>5d2. D300s>=7D. I prefer nikon's optics in their 24, 35, 50 and 85 fast primes as they bring together the best combination of sharpness and bokeh. In reality, they're probably very similar. Canon seems to be marketing at the aperture junkies with their ultra 24-70 from both parties didn't impress me at all, and felt more like expensive, well built kit lenses than the much nicer 70-200 flagships from both camps. Both have the 16-35 but Nikon has the option of perhaps the sharpest mainstream landscape lens.
I'm surprised at the 'more lens choices' argument coming from a pentax user, especially when Canon has about 9 more lenses than Nikon, and the lead goes heavily to Nikon if you include backwards compatibility. If there ever was any concern about AF on entry bodies and older lenses, then the person is probably looking at lenses that no entry level buyer would use. Nikon allows the OPTION to put on older lenses with quirks and issues, but canon has none. That's like saying apple is more consistent because it offers you zero modular choices.
I wonder how many people use 'old AI lenses on entry-level bodies' and if there is a single person in my state that does this. In contrast, how many people have APS-C specific lenses and a fullframe body at the same time? While canon has no option of mounting them onto the fullframe body, nikon allows it and it works acceptably with the full imaging circle with certain lenses, such as the 35/1.8 and 11-16.