I have destruction videos on my website, where we break a couple blades at the Willow Bow.http://www.reichprecision.com/tour.html
Arthritis prevents me from cutting until the blade is dull, so I generally make a couple hundred cuts and determine wear.
Many of my knives are proven in the field. Lots of guys count how many deer, antelope, elk, or moose a knife will go through before they bring them in for sharpening.
About 15- 20 deer is the standard. These guys are all very proficient users.