Bests & Worsts Reviews from Amazon

I just got my copy today and used it on a photo shoot with my Canon 5D Mk III. There's only one word to say. WOW! The sharpness is on a whole different level than anything I've ever used, the in focus area's practically pop off of the photo. The color rendition is really good as well. Chromatic aberrations are almost non-existent compared to other lenses in this category. Sigma said they wanted to challenge the Zeiss Otus and it looks like the have! Overall I would highly recommend this lens to anybody who wants a really professional quality lens on a bit of a budget. I will update this when I have had more experience with the lens. UPDATE: 7/3/2014 After having used the lens for the past few months I thought I'd make a few more points about it and upload some pictures to the user image gallery. The lens construction is really nice, the thermally stable composite material feels extremely stable and more like a metal than a polycarbonate. The focus ring is really thick, its wider than any of my fingers. The focus ring is also very grippy and nicely damped, which makes it easier to nail your focus evertime. Overall manual focus is a very pleasing experience. The lens did not need a single bit of AFMA, it was dead on with all of my tests right out of the box. Vignetting is minimal and completely gone by f2. Chromatic aberrations are hardl there, if the are its usually less than one or two pixels of fringing. Autofocus is incredibly fast, near instant in some cases. In focus areas are tack sharp, even at f/1.4 The bokeh is super blurry and very pleasing. While the depth of field is very narrow at f/1.4, you can easily stop it down and not have to worry about the out of focus areas getting jagged since the 9 aperture blades keep things smooth.