In reality, image quality is a subjective term. It is a property of the image viewed, and varies by viewer to viewer. There are certain objective measures of sensor performance, but none of them should be summarized as "image quality".
As I've mentioned before, reviewers all over the Internet would disagree
Ah yes, the Internet, with its vast array of infallible experts. Where else could nonsense spread with such efficiently that there is currently an epidemic of a disease in a nation where it was eradicated?
You clipped my quote. If Image Quality is a property of the sensor, then all Images produced using the same sensor (at same gain) must be of equal Quality, agreed?
Since that is clearly inconsistent with reality, the premise must be wrong, regardless of what reviewers all over the Internet say.
Those same reviewers would claim that every Image I make with my D7100 is of higher Quality than every Image I make with with my 5D3, and that both are always bested by my A7R. Neither claim is true. The Quality of my final Images depends on a hell of lot more than the sensor I happen to capture the initial data with.