Almost any scope is going to look clear and crisp on a sunny day. Where the higher end scopes work best are in the lower light situations like dusk and dawn or in heavy timber. I have several different brands of scopes and use them differently. My Swarovski is the best scope I own.
As far as them being the best? Well they are up near the top for sure. Schimdt & Bender and Nightforce are both at the tops in my opinion.