The Nikon D3 has been developed from the results of years of research & feedback from professional photographers, & is an amalgamation of a complete range of innovative Nikon technologies. Our Expert Reviewer Andy Rouse put the D3 through its paces in many different situations, each time finding it more than up to the task. " The D3 has amazing ISO performance, produces images with a beautiful dynamic range & has the best AF system seen in a Nikon DSLR so far. Is the Nikon D3 worth upgrading to from a previous Nikon DSLR? Absolutely 100%."