Rather than listing a company or product (I'm not aware of one), let me suggest why this might be so.
My belief is that good design starts with a good design as a base. User testing only refines and optimizes the base and not all bases are created equal. If you start with a bad design base, user testing won't help you reach the optimal great design overall, it will only help you make that particular base the best it can be. If your base is fatally flawed from the beginning, your product will also be.
In addition to the base design, I think one must look at the overall production strategy. A UI isn't just the design, it's the philosophy behind the design. It's how the design functions and feels. Apple is one of the very few companies that controls their entire production line and the customer experience (through their stores, app stores, and iTunes). They make a concerted effort to make everything related to their products and user experience as seamless as possible and try to retain as much control as they can. One company in charge of a UI/UX will usually be more polished than multiple companies trying to do the same thing together simply because of communication issues, varied priorities, and different design philosophies and implementations.
Does Apple get everything right? Not at all, but their integrated design philosophy helps give them a competitive advantage. However, I'd venture to say that their great initial design could be improved even further with user testing.