I am considering a Schmidt and Bender 4-16x50 PM II for hunting in low light applications, with shots up to 450 yards. I currently use a Kahles 3-12x56. Can anyone tell me if the S&B will have better "low light" ability than the Kahles. Also is there a noticeable difference in "low light" situations between the S&B 4-16x50 and the Swarovski Z6i 2.5-15x56 or a comparable Ziess Vitory scope. Any help would be greatly appreciated.