Posit: Xiaomi (a.k.a. “Mi”) poses a serious threat to Samsung because:
Xiaomi is more shameless, more willing to blatantly copy Apple down to as many details as they’re able.
They’re better at it. Xiaomi copies with some degree of taste; Samsung has no taste.
Xiaomi operates only in countries with weak IP culture and laws, further enabling and protecting them re: points 1 and 2. (This third point was first brought to my attention by Ben Thompson, when he was my guest on The Talk Show a few weeks ago.)