I've been enjoying my Sony zoom lens so much lately that my Sigma lens was being neglected, so I swapped her on today. Totally different lenses as the Sigma aperture ramps up to a f/1.4 with min f/16 vs the Sony f/5.6 to f/35. It's buttery smooth and I've worked out the cameras Clear Image mode so I can still zoom the Sigma digitally without losing detail.