Instruct: Classify the given Amazon review as either positive or negative.
Query: Legendary Canon lens lives up to its name

I've been an amateur/professional photographer for years and have used dozens of lenses. The 17-40 f/4L is amazing. Extremely sharp and a great range of zoom no matter if you're on a 1.6 crop factor or full frame. I have had absolutely no complaints about this lens and I have found no fault. My only words of advice are to slap a high-quality (B+W or heliopan or top of the line hoyas) UV filter on the front to protect the front element, that's about it.Enjoy this lens guys, can't go wrong with it.