DXOmark added lens measures and scores to their website. Currently 16 Nikon lenses are part of their database. The highest lens + body score (61) goes to the 70-200mm f/2.8G IF-ED + D3x combo followed by the 85mm f/1.4, 50mm f/1.8D and 50mm f/1.4G lenses:
Here are the top 7 Nikon lenses based on optical metric scores (filtered by resolution):
They also have a lens compare feature.