Summary: I tested this lens on the Nikon D800. The lens is super sharp, but was designed with a huge amount of field curvature. This means that for landscapes/cityscapes and other far-away subjects, you have to stop down to past f/8.0 to get sharp edges on the D800. This is a lens designed for being used wide open at close range - important to know if you plan to use the lens for another use. I think it's pricey for what you get at current Amazon prices.
Excerpt: I use this lens very often, <br />and in real life photos, it's flawless.<br />It is sharp @ f/1,4<br />But...<br />Slow and noisy AF with huge barrel distortion is huge disappointment! <br />I am not pixel counter, I will rather photograph my kid and make nice memories instead of waste my precious time by counting technical flaws of the lens.