Mike Reichman discusses quality, size, and price of cameras in the digital age.
"Today though, there is a direct link between image quality and price. Using the same lens a 1960's $200 Nikkormat and a $1,500 Nikon F would produce identical image quality. The camera itself hardly contributed to image quality. It was the type of film and especially the film format's size that mattered most.
This is definitely not the case when it comes to today's DSLRs. Continuing the Nikon analogy, a D40 and a D3x produce different image quality but are separated by more than an order of magnitude in price!
Now we get to the crux of the matter. How big is that image quality difference?"