If it adds to the discussion attached link from Precision Rifle Blog shows what the top PRS shooters in the US prefer:
Best Scope – What The Pros Use - PrecisionRifleBlog.com
For those using either the Kahles K525 or S&B 5-25 the Kahles was almost 2:1 ahead of the Schmidt.
Personally have a K525 and cannot complain. On the basis that differences in perceived optical performance are likely to be entirely subjective for top scopes, I chose Kahles for the left hand windage and fully ambidextrous parallax adjustment (which, for those who don't know, is just below the elevation turret i.e. on top).