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This is the best lens I've ever used. I call it my "bag of primes." It is incredibly sharp, not just among zooms. And of course, it is as fast as many prime lenses. Downside is the size and weight, but hey, it's ƒ2! Of course it's big and heavy! It is still smaller and lighter than full frame zooms of similar reach that are a full stop slower! I think this is the ultimate "event lens." I used it to shoot a three-day conference recently, and it performed wonderfully, both in classrooms, and in a dimly-lit, 1,000 seat auditorium, with the help of the EC-14 teleconverter. It should also work well for weddings, portraits, and photojournalism. Positives: Incredibly, almost painfully sharp, at all focal lengths and all apertures, from edge-to-edge, from infinity to closest focus. One prominent review site said it was the best zoom lens of any kind from any manufacture that they had ever tested. Amazing fast ƒ2 maximum aperture, at all focal lengths. Very nearly as good with the EC-14 teleconverter, as a 49-141mm ƒ2.8 lens. Great bokeh and subject isolation when used wide open. Extremely accurate and reasonably fast auto-focus, at least on the OM-D E-M1 Mark II. It was a $3k lens at one point, but can be had used for well under US $1,000 these days. Can be used with the EX-25 extension tube for close manual focusing. Excellent build quality. Negatives: Big and heavy! Lacks close focusing. Focus is slow on non-PDAF bodies, which I think is all but the Olympus OM-D E-M1, and its Mark II sibling. No auto-focus with the EX-25 extension tube. Focus changes with zoom, so limited use for video.