As we all know all too well, since the advent of APS-C digital cameras one of the main problems with these have been the lack of good wide-angle and ultra-wide-angle options compared to full frame cameras. Recently, though, things have changed. Sigma, in particular, in recent years developed quite a lot of WA and UWA lenses for APS-C cameras; though much slower than their FF counterparts, some of these lenses are really good. Since Landscape photographers aren't as concerned with speed as other kind of shooters, I thought it worth to test the D800E with the 14-24mm against the Sigma SD1 Merrill with the 8-16mm, despite the differences in specifications.
The results have been nothing short of astonishing, especially considering that the Nikkor 14-24mm f/2.8 AF-S is considered by many as the best UWA lens ever made. Unfortunately, the whole article is too long and it has too many images to copy it here, you can read the comparison and my user review on my blog
with all my findings and a lot of test images as well. I hope you'll find it as interesting as I did.