I get just by zooming around on prime lenses. Why, the D800 shows the differences perfectly. The 1.8 / 85 from Nikkor showed me the difference also against 'pro zooms'! So a fixed focal length WW: Bought and completely surprised again a notch! A section of 820x580 from an image of 7300x4900 so sharp that you could print it as a picture! Incredible! Of course, MF, large aperture, it takes a little routine for quick work and skills, but then .... just great!