Tesla's Optimus is not the first humanoid robot, nor the best; Boston Dynamics has been making incredible human-like machines for years.
But Optimus has one major advantage: it has a massive software backend. Tesla recognized early on that both cars and robots are really just mobile extensions of a central processing system. The Optimus is intended to be always connected, and to share its expertise as it learns. Similarly, their vehicles are connected, and share traffic data to help drivers avoid congestion and accidents.
The Chinese humanoids look very much like Optimus, just as the Chinese EVs are basically copies of Tesla vehicles. That said, the Chinese are innovating at a mad pace, and Tesla's main advantage seems to be its advanced software (as Chinese car makers admit), at least right now.
An interesting analysis I heard recently on one of the Tesla analysis youtube channels (The Tesla Space, I think): Tesla is probably going to lease its robots rather than attempt to sell them all. It will "uber" them to companies that need such machines but can't afford to purchase a fleet of them. Just pay $50/hour per robot, train them, and put them to work on the assembly line or in the shop. The revenue stream is constant, and can grow almost arbitrarily.
Fun times ahead.