I directly compared the Otus to the flagship 50mm lens from Canon, the EF 50mm f/1.2L. I praised that lens in many ways, and I do think it has more to offer than some have given it credit for. […] But at the same know that in every measurable head to head comparison (other than autofocus!) it was no contest. The Otus simply destroys it. The Sigma 50mm f/1.4 ART series lens is somewhat better competition in terms of sharpness, and (to a lesser extent) contrast, but in overall image quality it falls short of Otus. The Sigma ART is a very nice lens, but, ironically, it isn’t nearly as “artful” as the Otus 55. The Otus has not only the biting sharpness and overall contrast but also adds a truly beautiful out of focus rendering that just seems to produce more “creaminess” than any of the lenses I stacked it up against.
Photography Blog reviewed the Canon EOS M3. In the conclusion:
[…] the EOS M3 is […] a good camera, and if you already have a number of EOS lenses, it’s a logical choice if you want to reduced the size of the overall system. With the addition of a much faster AF system, control and exposure compensation dials, bigger handgrip and a tilting LCD screen, more experienced photographers will find much to like. It really does need an integrated viewfinder, though – the days of buying an expensive EVF that takes up the flash hotshoe are long gone when all of the EOS M3’s principal rivals have one built-in, in a similar body size and at the same price-point. In terms of image quality, the EOS M3 happily fits the bill, with the new 24.2 megapixel sensor delivering very pleasing images throughout the ISO range.