When in my home, I use the best manual can opener I could find. It is, however, too heavy for hiking. But guess what? SO ARE CANNED FOODS! Sure, my SAK opener will work if I find a need in the field, but I can't remember the last time I actually carried canned goods when hiking or backpacking. My legs just do not appreciate it. If I'm using a snowmobile, ATV, or other vehicle for my journey, and I bring canned goods, my Cadillac can opener comes along.
Regardless of how well it compares to others, the SAK opener works well enough when there are no other options. And that's what it's for... use in a pinch. SAK's are great little knives, and the can opener is just a part of a safety net, IMHO. Plus, since I have one with me often, I find it works great when I need it most, at parties, when opening clamato juice cans. These are the true emergency situations, anyway.
BTW, my CS Trailmaster and I have mastered opening champagne bottles, so the SAK corkscrew is of little use to me.
JET