Haven't looked at the Kahles. I did look at the 3-20X50 S&B. I ended up with a S&B 5-25X56. I am not sorry. The glass is a level above anything else I have looked through. It replaced a Leupold Mk4 3.5-14X50. The Leupold is a very, very good scope but the S&B is better. FWIW, the S&B glass is made by the same company that makes the glass for spy satellite cameras.