The lens construction consists of 12 elements in 9 groups, including 1 AA (advanced aspheric ) lens and 4 ED (extra-low dispersion) lenses which can effectively suppress chromatic aberration. T2.0 light transmission can achieve excellent resolution from the center to the edge.
It is a large diameter lens and features high transparency typical of prime lens. To create a background with a blur effect like cream has extremely strict requirements on the distortion and vignetting. The lens also produce rich and delicate color of the photo, making it more cinematic.
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I was hesitant to try a cine lens on my Sony A7R. Checked the internet but none actually tried cine lens for still photos. It is an amazing lens, extremely sharp corner to corner, and edge to edge at f8.5. Have not tried other apertures, but they should be just as good. At f8.5 and probably smaller aperture it is excellent for landscape photography. The lens is heavy, and I have to buy a lens collar (ishoot brand) with 76mm internal diameter to support it - had to pad the internal diameter to 69mm to fit the lens into the collar. It works perfectly with the collar. Still photographers should consider cine lenses when they are on special. Viltrox S20mm is really sharp, and has less distortion than the usual camera lenses. It is a gamble to buy the cine lens and I have no regret, and it will now be my favourite lens for landscapes.