Welove to hunt coues whitetailhere in Arizona. However high power binos and tripods are pretty much the ONLY way tosucessfully find the wary prey. Myself and some co-workers did a side by side comparison of a few 15X binos (as well as a 12.5X)looking at hills and mountains... here arethe binos we used as well as our results!!!

All binos are their companies top ends.
Fujinon 15X56
Minox 15X60
Vortex Viper 15X50
Swarovski 15X56
Pentax DCF SP 12.5X50 (yes the ED's are supposed to be better, however they only make them in 10X)

--As expected the Swarovskis were the best overall, stunning clarity, good field of view, simply put.....AMAZING!! (for 2,000$$ they better be!!!!)
--The Vortex Viper to our surprise was the next best, only SLIGHTLY behind the Swaro's, field of view was a littlesmaller, however the clarity was so close we had to really look hard to see a difference!! Light gathering was actually better than the Fujinons and the Minox this was evident when looking at shadows, and at sunset.Vortex did a great thing when they designed these binos, GREAT glass,GREAT coatings, and an amazing warranty.
--for 599$$ a SMOKIN deal for how good these binos performed!!
--The Fujinon,the Minox, and Pentaxwere so close they are pretty much interchangeable,All threecontain very good glass respectivly!!

Not a scientific study, just regular ethical hunters looking through our binos
P.S. three of us have bought the Vortex since we did this

Be safe