...not sure why, but this was a double post....so I removed it.
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Could you post a link to the lenstip.com comparison where you are getting your information? Sight unseen, I would bet the house the Sigma 35 is nowhere close to the Otus 55 in the corners @ f1.4
But I don't understand why people need a wide angle with F2.8. You don't do portrait with a wide-angle that had "by nature" some distortion.
I had one lens with a bubble and then different lenses with clicking when I tried to buy this lens last fall. Since I could only vote once, I voted for the bubble....
In past years, it was common for some of the better glasses to have bubbles. Some glasses with highly desirable optical properties couldn't be heated to a high enough temperate to become fully fluid so that bubbles would naturally escape. At one time bubbles were even viewed by some as a mark of quality. Now glass technology has advanced, and sometimes platinum crucibles are used, so bubbles are no more. One or a few small bubbles will have negligible effect on your images.
I think you've been had by a troll.
So I guess your tally is 0.
What happened? Market saturation.
I had one lens with a bubble and then different lenses with clicking when I tried to buy this lens last fall. Since I could only vote once, I voted for the bubble....Sorry for that, I was trying to find a way to avoid inconsistency (say select both a problem and no problem) but I guess some inconsistency is inevitable. For example someone may had a faulty lens which returned to get another. They could select the specific problem but then the 100% correct would be to select both.
I just wanted to add my thoughts about this lens after about six months of using it all over the world. As far as the optics go, it pretty much crushes my old Canon 35 1.4. Autofocus accuracy is pretty good, and the general construction of the lens is almost "L" quality. That said, I have found one major problem with it. While in Bangkok covering the protests last week, the autofocus driver died numerous times. It was clearly connected to the humidity (which never got THAT bad, about 80% while I was there). I have been in contact with Sigma, and will update when I receive a resolution. Obviously, the Sigma isn't weather sealed, but if the lens can't handle a mildly hot and humid afternoon, I'm not sure if I can give it my trust anymore.
All of that said, unless you are working in weather extremes, buy it, it's a hell of a lens.
Seems there ought to be a DIY way of adding an o-ring at the camera mount.
If the Canon EF 35mm f/1.4L is weather sealed, I see no evidence of it. I suppose it must be, though.
I'm curious if any of you have done astrophotography with this Sigma lens. If so, is there much coma toward the borders, and if so, how far does it need to be closed down before that goes away? I'm sure somebody has talked about this before, or perhaps over at lensrentals when they imatested it...but I forget.