Pi Chapman Offline Upload & Sell: Off
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I've been using lots of 50mm lenses, including Canon 50 1.4, 50L 1.0 and 1.2. In my personal opinion Sigma 50 1.4 has the best overall IQ from all of them. The only thing it cannot give you is wider aperture, but even on 1.4-2.0 it delivers photos with the highest resolution, minimal amount of CA, the least vignetting in the 50 class (Sigma has the longest diameter, even longer than Canon Ls - 77mm filter). I love everything about this lens. Of course it doesnt have 1.0-1.2f but when I had Canon Ls I was using them rarely as resolution was very low when shooting wide open.
As it comes to AF issues - a good copy has the fastest AF in its class. Mine is noticeably faster than Canon 50 1.4 and much faster than both 50Ls (and both have really sucky AF imo). One of my friends got a bad copy of it but after sending it to the service it worked as good as mine. I use mine on 5D mark II, sometimes on my friend's 1Ds MkII and the focus is as fast as my 2nd favourite lens - 135L.
To sum up, Sigma 50 1.4 is a great choice. I can recommend it to everyone that doesnt need 1.0-1.2f and weather sealed body (actually I've been using Sigma on quite a heavy rain and snow, nothing has happened, so it's not so bad in terms of sealing). Like the guys said, buy it at a shop with good return policy in case of some problems.
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