I got the chance to compare a bunch of Kowas, Swaros, Vortex, and Zeiss side by side this fall. I didn’t have the top of the line Zeiss, and most were in the 55-65mm category. I wanted to like the Kowa best in all ranges, but ultimately I preferred the Swaro ATC in the 55mm range and the Kowa in the 65mm range.