The first law of lens testing says not to compare tests on one model with tests on a different model camera. That law does not apply to France, of course, they have their own set of rules.
There is also the small matter if using a undefined number to rate sharpness rather than the standard resolution used by the rest of the world. What is Perceptual Mpix? As far as I know, its a rating that is determined by a secret formula that no one else knows or can repeat.
So, wait for other testers to weigh in with their test methods that are repeatable and at least comparible across testers. Roger at Lens Rentals will eventually look at the results using just the lens with his tester, that takes the camera out of the equation, so its another data point.
I have no reason to believe that it is not a super lens, Canon does compromise between producability, repairability, and pricing and leans heavily toward profitability. I think that Sony makes a lens more expensive to produce, very difficult and expensive to repair, and has a fat profit as well, that's a common denominator.
Companies buying equipment often look at a thing called Life Cycle Costs. I suspect that the Sony cost over its life is going to be a huge difference. For Enthusiasts who do not use a product day in and day out, its likely a lesser cost, but, if they drop one, they will wish it were insured.