was very skeptical about the purchase, since I've been a photo amateur for many years, I have all high-end professional lenses. I was looking for a versatile lens, mainly for street photography, to carry daily with one of my machine bodies (Canon 6D), not bulky and light, but I really had no intention of spending 6 times as much for the original Canon . Contrary to what some have claimed, I recreated myself!! The lens does its job well, good sharpness even at full aperture, gives good colors, precise focus, excellent brightness and I don't understand certain comments from some that I suggest learning to use the SLR first and then everything else. By the way, it's not as loud as many claim. Of course it is not flash with MAF and it is not comparable in quality and construction consistency with the original, but for the use I have to do is fine. Not recommended therefore clearly for professional use, I recommend it for those who are starting to do photography and want to try using a fixed lens, but also for those who are already a “developed” one and do not want to give up to get great ones to spend figures.