It wasn't your definition of "something else" that I was bothered about. It was your definition of "better". And now it's your definition of "good" as in "as good as I can get".
If you're after the widest lens that will fit on your 1D Mk II then it's the Sigma 12-24mm f/4.5-5.6 EX DG HSM. If you're after the widest Canon lens, it's the EF 14mm f/2.8 L II USM. If you're after the widest Canon zoom, it's the EF 16-35mm f/2.8 L II USM. If you're after the sharpest wide lens, it's the Nikon AF-S 14-24mm f/2.8 G IF-ED, but you'll need an adaptor to mount it on your camera and of course it will be manual-only. If you're after the sharpest wide lens which you can use without mucking around, it's the Canon 14mm or 16-35mm depending on whether you prefer primes or zooms. If you're after the best value wide lens, there's a good argument in favour of the EF 17-40mm f/4 L USM.
So ... what exactly are you after?