My Sigma 35mm 1.4 ART had to get sent to Sigma for a repair to the rear mount a couple of weeks back. A few days ago, it arrived back home and looked to be in near-new condition again. I have a wedding next weekend and wanted to push it through some more challenging conditions. So I bundled up my 3 yr old son and went out for a snowshoe hike in the woods near my house. I am happy to say that Sigma did a great job servicing it! The auto-focus seems tighter and it’s still very sharp.