It's only missing the L-ifying front UV filterelement that adds contrast & resolution, cancels out CA better than flourite and un-vignettes the image
EOS M | 5D III | 1D X EF 24 1.4L II | 50 1.2L | 85 1.2L II | 180 3.5L Macro | 300 2.8L IS II 16-35 2.8L II | 24-70 2.8L II | 70-200 2.8L IS II TS-E 24 3.5L II :: Extender 1.4x III | 2x III :: EF-M 22 2 | 18-55mm 3.5-5.6 IS
Walter: Were you listening to The Dude's story? Donny: I was bowling. Walter: So you have no frame of reference here, Donny. You're like a child who wanders into the middle of a movie and wants to know...