I usually manage to destroy a knife at hunting camp. I have on two occasions opened a can with a knife. The first one was a BM 970, which had absolutely no problem.
The second was one of those Cold Steel wood handled hunting knife jobbies, you know, the Hudson Bay company, or the Red River company, or whatever. Anyways, the tip went thru fine. The edge was chipped, rolled, folded, spindled and/or mutilated. It didn't do well at all.
As a lark, I took pics and sent them back to Cold Steel wondering why this knife didn't cut it as a can opener.

I mean, hey.... If they are gonna make an entire video of them hacking open oil drums, cutting car hoods, and chopping down tall buildings in a single bound, then they can at LEAST let me off the hook for innocent can opening.
Bottom line on all this rambling? A couple of points..
1. Use a can opener or a .45
2. Cold Steel can abuse a knife in order to sell it to you, but you better not try it yourself.
3. If you really think you should open a can with a knife, make sure it is not a thin hunter/skinner type. Use a tactical with a bunch of meat to the edge.
4. If you come to hunting camp with me, make sure and bring a knife you don't mind losing.