I have a razor 27-60x85, gen 1. I also have swarovski 25-50x65. Razor is very close, swaro is a touch more clear at long distance. I watched a buck at around 1000 yds, had both scopes out while my boy was getting closer to it and the swaro had a slight edge on it, to me. We Spotted more deer and another guy had a tract and my boy looked through it. He felt it was close to the vortex, but not heads and tails better. All comes down to what you like and spend. Never looked through a kowa to compare.
