I received the Sigma 50mm f/1.4 ART a few days ago (I pre-ordered on B&H on April 11th at noon; it shipped April 28th)
I haven't seen too many user photos so thought I would provide some comparisons with my Canon f/1.2 in the event that might be helpful to some looking at this lens.
I have all Canon-branded lenses currently, except the Sigma 35mm f/1.4 Art, which I love. I have found it to be a good focal length for all around shooting and love it for low light. As such, I was interested in checking out the 50mm version, even though I've already got the Canon f/1.2 version (and I feel like I have a really great copy, as I had one prior to my current one and didn't get the same results/experience).
So I haven't really had a chance to use the new Sigma 50mm Art property, but I just quickly took some random pics in my house.
These are not meant to be great photos, but just provide some comparisons against Canon's f/1.2 version of the 50mm.
What I did was put each lens on its own Canon 5D Mk III (I have two) and took photos all at f/1.4 and at varying shutterspeeds (had on manual with Auto ISO). So the settings are more or less the same in each shot, one taken after another. So not scientific at all, but gives some comparison...
These are straight OOC JPEGS saved down to 1024 pixels for this forum... if you want any 100% crop of the originals for anything, let me know.
My biggest take-away is that there is more color and color contrast in the Sigma shots... and Canon blurs OOF lights more. Will have to experiment more with some night time / dark shots... Also, you can focus closer to the subject with the Sigma with autofocus. Sigma also has a quicker focus going from, say, across the room to something close up.
I know there's been talk about focusing issues... I was using single point autofocus, and didn't have any issues at all - it seemed to hit what I was focusing on pretty reliably. But again, these aren't great photos... just some quick snaps.
Currently, I'm really impressed with the Sigma. But am withholding judgment until I can take some portrait photos and put it through it's paces on that front...
In each photo below, the first example is the Canon 50mm f/1.2 and the second example is the Sigma 50mm f/1.4 ART:
Thanks for the comparisons Jason!
To be totally honest, I have a hard time seeing any difference at all (watching this from a crappy laptop screen). If I strain my eyes, I might agree that there might be some slight color renditions. This bodes well for the Sigma, as I love the 50L, but could not afford it.
Btw: Love to see others who value good knives
Six Kai Shun.. I love mine.