The old Nikon Nikkor 28mm f/2.8 Ai-s is regarded as one of Nikon's sharpest lenses ever with zero distortion. Here is a quick comparison with the AF-S Nikon 17-35mm f/2.8 at 28mm. The photo below was taken with the manual focus 28mm f/28 Ai-S. Roll over the image to see the photo taken with the 17-35mm f/2.8 at 28mm and notice the visible barrel distortion in the zoom lens.

Here is the classic 28mm f/2.8 Ai-s that we at IDIC photo use for situations where a wide-angle with zero distortion and extreme close focus is desired.