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Excellent build is rare to find lens really sharp at f/2.8 wide open even on APS-C. But the real value for me is this lens brings great sharp images even on low light conditions. And one rectification my version of this lens has 9 aperture blades no 6.
Has no weakness for me
Today's photography with really high ISO in low lights conditions photography is a time the lens to be tested separately in low lights conditions too, it is really wrong who think all the nice wide open lens will perform well in low lights conditions will be surprised sometimes one f/4.0 will be greater than one f/1.4 lens ... and back to this lens this one is a great night photography lens :)