Originally posted by Samsungian Well the very best ultrawide is Nikon's 14-24mm 2.8
To use it on Canon body costs around $300 for custom adapter:
Nikon G - Canon EOS Adapter
The Canon 16-35mm 2.8L II is a very nice lens also. I own both, but choose to add D700 Nikon to drive their 14-24mm 2.8 instead of buying adapter. Adapter maker takes 6 months or longer after you pay to fullfill order so that may be a problem for some/many. For me it comes in handy to have two ultrawides as the wife and I both shoot at same time. I suspect I'll continue with dual brand, Canon and Nikon forever. Each system has its pluses.
D700's 12mpix chip is holding back the 14-24. It simply does not allow that kickass quality you get out of D3x. I have had D700 + 14-24 for 1.5 months now and shot ~1500 shots with it when trying to learn it's complex field curvature and how to actually focus it properly. Call me heretic but the quality I got with K20D + Sigma 10-20mm wasn't actually that much worse (if any). I tested my 14-24 in the local shop with D3x and dude, there's a LOT in reserve in those additional megapixels...
So I'm waiting for D700x if it ever comes. If it doesn't, well
I ended up with D700 because the used 1Ds MKII I actually purchased was screwed up by local Canon-certified service. They destroyed the sensor while "cleaning" it up. Now I was very upset due to that. Still am.
I EVEN ORDERED THAT DAMN nikon-g to eos adapter, which by the way, takes ages to get it seems. Fortunately I can sell it for premium price
I expect to get almost double price out of it. They are that rare.
EDIT: Forget to add that the 5D mk1 + 17-40L combo I had for a short while wasn't bad either compared to D700 + 14-24. Only thing were it sucked was the foreground sharpness. However, put that 17-40L to 5DMK2 and then *facepalm*...