I didn't know sapphire glass was this resistant. Very impressive. Note that it's common for high-end watches to have sapphire glass, so this is not exclusive to Apple Watch. But I'm pretty sure no other "smart watch" has it yet.
Interesting video, more so in light of Apple buying a big plant in Arizona just for making saphire glass. Today they use it on the camera lenses of their products and on the home button fingerprint reader of the 5s. What do they have in mind for this plant?