The katana making techniques (pattern welding, differential HT) were not unique. So is the performance. Claiming otherwise is perpetuating the myth. The Japanes

The katana making techniques (pattern welding, differential HT) were not unique. So is the performance. Claiming otherwise is perpetuating the myth. The Japanese sword got its "world renown sharpness" the same way magnum .44 become the "world's most powerful handgun" after Dirty Harry. Also swords are not very sharp even with highly polished edge. Too high angle. If you want to see something really sharp - take a walk to some of the better restaurants.