It isn't that much better from the Nikon side of the fence. I have just ordered the 12-24, and hope I'm not making a mistake. Nikon won't tell us where it is going--perhpas next week Nikon will announce that all future digital SLRs will have a 24x36mm sensor. The 12-24 DX lens is not designed for a large sensor. Everyone expects that Nikon will stay with the 24x16mm format, but no one knows.
Both Canon and Nikon exploit thier monopoly positions with those customers who have invested heavily in their systems. I hope Olympus and the open 4/3 standard does well. We, the folks who feed Nikon and Canon, will continue have our needs ignored until there is some real competition.