I'm weighing up a potential move to FF/Nikon this year with a D800/e purhcase and lens wise the main issue for me would be replacing my Canon 10-22mm with something that has a similar range and takes filters, the two obvious options seem to be the 16-35mm f/4 and the 17-35mm f/2.8 I shoot mostly landscapes and specs wise the 16-35mm seems slightly more appealing with the longer range, VR and weather sealing but I do take enough action/shallow DOF shots that the 2.8 appature of the 17-35mm would not be totally useless to me, espeically at the long end. What I'v found really confusing though is finding comparisons of these two lenses performance, alot of big sites don't cover them both and those that do provide a rather contradictory picture with reguards to sharpness across the frame. Most sources do agree than the 17-35mm is soft in the boarders/corners wide open but really those areas are only going to be an issue for me stopped down to f5.6 or lower. In that appature range some reviews seem to favour the 17-35mm(most obviously photozone) and others the 16-35mm. Does anyone have expereince of one or both of these lenses on the D800 or the D3x? I'd be grateful to hear about your expereinces with them.