They're really good at copying and improving. Look at the Jiayu G5; it looks like an iPhone, with the metal casing, except stainless steel instead of aluminium... running Android, with dual-SIM, expandable storage, and removable battery.
Well, some copies are good, some are bad. I think it depends how much problem they solved and how much improvement they contributed. The best always be copied by others.
look at xiaomi phone; android phone with iOS feel