Absolutely this is a USP. Entrepreneurship professors love to teach the concept of "Faster, Better, and Cheaper. You can have two, but you cannot have all three."
Also, all businesses are essentially one of two types: 1) do something entirely new, or 2) do something old, but innovate (i.e. do it faster/better/cheaper). Since it is nearly impossible to do anything that is actually truly new, most businesses fall into the second category.
Usability would fall under the category of doing something "better," though well-executed usability should also increase total efficiency, therefore ostensibly also making the product "faster."
Usability is a steadily-improving idea. A new product is invented, a competitor sees a way to make the product better/faster, another competitor then makes it even better/faster, and on and on. It's market-wide iteration. And at some point, hopefully, one of the companies will create a product with recognizably great usability. Usability is not an all-of-a-sudden event; it happens slowly, over time, and is a confluence of factors.
Of course, whoever finally gets to create the product with great usability gets to also take all the credit. C'est la vie.
EDIT: Specifically, this PG quote comes to mind: "In particular, you don't need a brilliant idea to start a startup around. The way a startup makes money is to offer people better technology than they have now. But what people have now is often so bad that it doesn't take brilliance to do better." (http://paulgraham.com/start.html)