HELP PLEASE....I shoot with a nikon D90 with 50mm 1.8, 35 mm and am waiting for my D600 to come in. I was looking through nikon.com sample images (http://chsvimg.nikon.com/lineup/dslr/d600/img/sample01/img_02_l.jpg) and was blown away at how sharp, defined and detailed the portrait images were...