In the field not much,IMHO. I guess my eye is just not good enough to tell the difference. Most of the guys that i know that buy $2500.00 bino's do so for the "look at me" factor. "I'm a Real hunter and can afford the best." and I'm cool. Just bought a pair of Pentex 9 X 32's and they work just fine. Of course I'm not using at midnight under a half moon or counting ring on a Big Horn at 1000 yards. I haven't noticed any loss on the "edge".If I loose, run over, or have then stolen I'm out less than $300.00. Some guys just like owning the best, so good for them. I'll spend my money on gas and tags!