Without reading ahead, how many stops of improvement would you guess that APS-C camera CMOS sensors have undergone over the past ten years? I'll give you a second. Okay, if you guessed 1.5 stops, then you were right on the money!
You might be thinking, “No, it must be more than that, image quality has improved a lot from cameras like the Nikon D80 to the Nikon D500. You're right, it's a night and day difference. However, this depends on much more than the physical image sensor itself.