nuguy,
In my own optical tests of Swarovski Z3's and a 3-15x42 Tract Toric, done at night on an optical chart of my own design, the Tract beat the Z3's by a significant margin.
That said, there are differences in the optics of various Swarovski scopes. The Z3's have above-average optics but don't match the optics of Z5's.
