Samyang/Rokinon 24mm f1.4 build quality variation

Samyang makes great lens. All have MF. If you want to take photos very quick - almost as with AF, you have to work oposite as we are used to (first sharpness than take a photo). Keep trigger down & try to find sharpness with focus ring. When you find focus, camera takes a photo automatically. After some exercise-photos you will work almost fast as with AF.
It works on my Samsung GX20 perfectly without mistakes.