I haven't had any first hand experience, but I haven't been reading any raving reviews regarding the Bushnell 6500 series. The magnification range would be nice though. I've read on more than one forum that they don't compare to the 4200 series as far as clarity. If someone wanted to send me one I'd sure test it out though
Kahles is either Schmidt & Bender's or Swarovski's second line
I haven't had any first hand experience, but I haven't been reading any raving reviews regarding the Bushnell 6500 series.
I have not had experience with the Bushnell 6500 but I have owned Bausch and Lomb 4400 and I will tell you they are not anywhere near Zeiss Conquest. I also own a Leupy and it DOES NOT stand up to the Zeiss either.