Battle of the super wides
Tokina 20-35mm f/3.5-4.5, Nikon version (77mm filters, 504g).
Olympus M. Zuiko Digital ED 9-18mm (18-36 equiv.) F4-5.6, m4/3 version (52mm filter, 155gm).
The Tokina goes on the Nikon F3 (analog) and the Oly on the GF1. To my non technical eye their performance is similar. The m4/3 has its advantages when I am out cycle touring / hiking providing a system where lenses are a third of size and weight of my analog camera. The F3 works in places where battery charging can be pain.
Everything has its beauty but not everyone sees it.