Bought this for my GH4 along with the sisters 8mm, 12mm, 35mm and 85mm. This one is a bit softer, with a slightly more open CA compared to the other four, hence the four stars. At T2 and above it appears much sharper. Otherwise I am very happy with this lens. Also, these lenses seem to exhibit some softness at T22, which I believe is a diffraction effect, and I'm not too surprised given the cost. In any case, it's unlikely I'll be using it much at this aperture as I have a range of ND filters that will cover most conditions. I'm thinking of adding a 50mm lens if I can.
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