A fairly high resolution even at an open aperture of 2.8 almost throughout the entire frame, and if you clamp it to 3.5-4 it is generally sharp as a razor) Rudeness was not noticed, distortion is present, but for such a wide angle of 11mm I think it is record low, which was a pleasant surprise. In general, I am very satisfied with the purchase, though it took more than a month to wait for the order, but it was worth it! I managed to save 700r because during this time it grew in price)) I have long wanted a fast aperture "wide" because. a tripod is not always at hand, and for shooting landscapes handheld on dynamic travels, this lens is suitable like no other. The build quality is on top, maybe because my copy of Made In Japan)) does not play anything, the rubberized focus and zoom rings spin smoothly, it is a pleasure to induce) In general, I advise you, excellent glass !