Somewhere on the great 'net, is a video of some guy testing the SAK cutting. He takes a Sad, and cuts on some hemp rope and then slices paper. he cuts some more and says it probably won't cut the paper now, but it does, and he is surprised. He then cuts some more rope and tries the paper slice again. And again the SAK neatly slices the paper. He then cuts more rope and the SAK keeps in slicing the paper cleanly after each number of rope cuts. He talks about how he wasn't expecting that.
A few years ago I took delivery of a large sofa over at my sister inlays place while she was at work and couldn't take off. It came literally cocooned in heavy duty cardboard. I had forgot the Stanley utility knife that I was going to do all theunboxing and breaking down the cardboard for the recycle bin. I used my SAK tinker. For two hours it cut, and then cut some more. Once I thought the edge was gone, but it was just glue buildup on the blade. Some Purrell hand sanitizer and a paper towel cleaned it off, and I finished the job. no sharpening needed.
People, especially knife nuts, always underestimate the cutting ability of a SAK.