I bought it already having 16-35 / 2.8L II, and for good reason. Although it does not allow blurring the background in the same way, the sharpness throughout the frame is much better - it is immediately noticeable that Canon has thoroughly worked on the mistakes. The stabilizer helps a lot when shooting video and in low light. I use this lens as the main tourist lens when traveling - I put others on only when necessary to shoot something more artistic.
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