Who has used this lens once will want to have it and not give it back. The imaging performance speaks for itself .... just L class. Of course, the high light sensitivity also has a certain weight when lens causes, but ... it's worth it. The lens is shown riding absolutely valuable and the feel is great. Imaging performance, I will discuss here in detail since there is to read on the Web massive test. The Image Stabilizer done a great job and kopmpensiert up to 4 stops. For me, at this lens everything "around" so as you can expect it.