Sigma's series of ART lenses have been out for some time now. Having been very happy with my set of Samyang cine series lenses I've only had one eye on them as more and more people are starting to use them for their video creations. I dipped my toe in the water by purchasing the Sigma ART 18-35mm early this year, mostly for it's 1.8 aputure. However I find myself growing more and more frustrated with the lack of sharpness at wide open on my Samyangs. Now from what some peers