The "quality" you are referencing is available to maybe the 1% of the population that can afford it. A rich Canadian that is facing a life threatening disease and discovers that the best surgeon for his condition in the world happens to live in NYC will travel there and pay whatever it takes to save his life. The "concierge" service he/she receives will be beyond what any American, with any level of insurance receives because he is paying CASH. Americans are travelling to places like Thailand (which BTW has stunning modern hospitals with American trained doctors) because he can receive BETTER care at a fraction of the price, depending on the procedure.
When 99% of the quality is no better than elsewhere at 4X the cost, then the remaining 1% that happens to be better for those that are uber rich does not make it a better system.
Again, there are pros and cons to both systems depending on your illness and financial position. Have a herniated disc and need an mri and an elective discotomoty, and have good insurance? I'd rather be in the USA. Have some chronic condition that requires ongoing meds, diagnostics, and doctor visits? Canada please.