SQF data was Excellent at the three tested focal lengths, indicating the superior sharpness and contrast for which Leica is known. DxO Analyzer 2.0 distortion results were virtually identical to the more expensive f/2.8-3.5 lens: Visible barrel distortion at 14mm (0.40%), Imperceptible barrel distortion at 25mm (0.03%), and Imperceptible pincushion distortion at 50mm (0.01%). Light falloff was also identical: Gone by f/5.6 at the extreme focal lengths, and by f/4.6 at 25mm. This is outstanding performance for a zoom that reaches as wide as 14mm. At the uniform close-focus distance of 11.25 inches, maximum magnification ratios ranged from 1:12.6 at 14mm to 1:4.75 at 50mm -- significantly better than the 1:5.4 of earlier lens. Using DxO blur factor analysis, we found an average of 1.5 additional handheld shutter speeds for four shooters using MEGA O.I.S. Not surprising, as stabilization is usually more effective in longer lenses.