There is a very sharp lens Drawing already at full aperture. I got it with my Nikon AF-S 1: ED 18-35mm 3,5-4,5G compared with 20mm and can make no difference determined what for the fantastic performance of the zoom speaks at the far end. I have my D800 mounted on the tripod and with LiveView focused. The 18-35 is, however, weak at the 35mm end. I did it with the new 1.8 35mm compared and here the fixed focal length is better by far. The 35mm I keep and the 20mm returned. Who needs the 1.8 aperture at 20mm, it is strongly recommended. For me, the 18-35 flexible.