Summary: This lens is one with few shortcomings. Optically it is sharp from maximum aperture, with negligible levels of CA, distortion and falloff. In short, it is about as good as lenses can get from a technical standpoint.
Pros: Excellent resolution performance, Negligible CA, Low distortion, Low falloff at maximum aperture, Good build quality
Cons: Fly by wire focusing system takes a little getting used too, No focus range limiter