Does anyone shoot both Canon and Nikon - Canon for long lens and Nikon for wide angles? Experience? Thoughts?I owned the 14-24mm, which I only shot on my 5D3 (I sold it recently). The lens is really big and heavy, and takes a LOT of space in the bag. I found it to be about as sharp as my TS-E 17mm, and the sharpness is edge-to-edge, with little distortion. Since I was shooting manually via an adapter, I suspect that it would be sharper on a Nikon body. It has a fair amount of chromatic aberration. It has little coma. It can flair, but it did not flair as much as I thought it would. I use filters quite a bit and missed them when using this lens. There are kits that you can buy, but they are expensive and take up a lot of space in the bag. The lens renders beautifully. More than any lens in my kit, images from this lens had a painterly look to them and a subtle 3D pop; a little like HDR, but without the HDR.
My general impression is that it is a great lens, but the price you pay is an exposed front element, massive size, and chromatic aberration. Since I use it exclusively for landscape, I found that I did not need the f/2.8 aperture, and as a result, the 16-35 f/4 makes a lot more sense for my type of shooting since I rarely venture from f/5.6 to f/11 or so. Hope this helps.