If you've been contemplating the purchase of a 14mm f2.8 lens for your D1 , DCS 620 or DCS 620x, be sure to download the full-resolution D1 sample photos posted Saturday, as well as the additional photos posted today, by Juergen Specht. If you want to see Specht's photos act fast; he plans to remove them from the web on Wednesday.
I've used both the competing Tamron SP 14mm f2.8 and Sigma 14mm f2.8 EX lenses on a D1, and each would be hard pressed to match the clarity of Specht's Nikkor 14mm f2.8 ED shots when viewed at 100% magnification in Photoshop. At first glance, it looks like the Nikon super wide lens might be worth the several-hundred-dollar premium it commands over Sigma's and Tamron's equivalents if image quality is the primary consideration.
The Tamron, however, has one notable advantage over the Nikon: it has an innovative push/pull focusing ring mechanism for switching focus modes that makes it quick and easy to switch from autofocus to manual focus without taking the lens from your eye. The Nikon 14mm features the same M/A twist ring as, for example, the Nikon 20-35mm f2.8D, which I always found too cumbersome to use in a hurry. If you intend to use a 14mm for spot news or other fast-moving photography, the ability to quickly switch from auto to manual focus is important. Therefore, you may wish to check out the Tamron SP 14mm f2.8 before settling on a super wide lens for your digital camera.
If Specht's photos don't satisfy your appetite for Nikon 14mm shots, have a look at Peter Ibbotson's web-resolution comparison photos shot with a Nikkor 14mm f2.8 ED and an older Nikkor 15mm f3.5 AIS on both D1 and F5 cameras.