True, but is that anymore convenient than card tap? Also, We are seeing QR payments happening in the states also (like at Starbucks) though I honestly don't see the point.
I've not seen contactless card payments in China. I imagine both businesses and consumers would be worried about fraud. Quick payments with a mobile wallet (where the retailer scans a dynamic QR code on your phone) feel safer, as you need to explicitly go to that screen, and you get immediate notification on any transaction on your account.