Have no idea about the Leupold VX-6, but I have a few of the Leupold 4.5-14x50 VX-7's, have owned a handful of Burris scopes (all gone now) and currently have 5 of the Swaro Z-6's. For my eyes, the 2-12x50 Z-6 is the clearest, brightest scope I've ever looked through, and it's not even close.