Laowa lenses received good reviews when I was still in the hobby of photography. Did not see many comments on Yongnuo and Viltrox though. It was the camera makers to blame for lacking autofocus with third-party lenses on their camera bodies. The Japanese keep the electronic interface between lens and the body tightly closed as a trade secret. Even lens from Japanese manufacturers such as Sigma are often expected to have quirky autofocus on bodies from, say, Canon or Sony.Chinese lenses from the likes of Laowa and Yongnuo have long been capable of excellent image quality, but fell short of more esteemed rivals due to their handling difficulties, as they generally lack autofocus, or indeed any electronic communication between host camera and lens. The latest Viltrox lenses have no such compromises.