Perhaps you'd like to expand upon this as I fail to see any parallels with the whole world moving to digital in its many forms & in this instance, a fundamental change in imaging from the ground-up - and you siting an extra tooth on the rear cassette from one manufacturer!
Light is still the same light we used to capture on film, yes?
Excluding slight improvements here and there with optical design and better lens coatings, what's changed?
I use a 5DMk2 with a full-frame sensor hugely critical of the lens mounted on it. I've used Canon's 50 mm f1.8, Canon's 24-70 f2.8L, Canon's 24-105 f4L , and an old 70's era Olympus OM Zuiko 50mm f1.4 and performed some tests in the past. The Oly comes out top for sharpness both in the centre, and at the edges of the frame when stopped down, and gives by far most natural smoothness when wide open as far as each of the lenses will go. In actual fact, my favourite portrait lens on the full frame sensor has to be my 90mm Tamron SP f2.5 Macro of 80s vintage - razor sharp where it needs to be, but provides a very pleasing softness outside the focus plane. Both those old lenses give less CA than the L-series glass.
So, aside from ultrasonic focussing (not really an issue) or IS/VR - again, not so much of an issue with fast lenses and rapidly improving high ISO sensitivity, what are the improvements in modern lenses?
Could it simply be that new is better because we are told new is better, and perhaps autofocus is a ms faster?
As far as I've seen, the only real areas where new lenses are worth the outlay is at the very wide end, or at the hyperzoom level, where convenience of one lens overrules IQ?