Digital Review has an interesting in-depth comparison between the Nikon D90/D5000 and the Canon Rebel T1i 500D. Nikon offers better build quality, double the shutter life, better ergonomics, better button/menu/interface design, better image quality, better video mode, lower pixel density, better high ISO performance…not to mention the whole lineup of lenses that so many Canon V-SLR shooters are picking up so they can shoot better video on their Canons.
Short translation: the Nikon kicks the crap out of the Canon. Again.
There’s a tremendous difference between price and value. I’m not afraid to pay top dollar for what I buy, but only if by paying more I’m receiving a greater value. I’m frankly surprised so many people can willingly spend more for less, as is almost always the case with Canon cameras. I think, generally speaking, that Canon shooters don’t understand that “more megapixels” doesn’t automatically mean “more camera”, or better images for that matter.