All impressive stuff. Michael, the lighting on your plant photos is just wonderful.
Owning the 70-200 FL, and cross-referencing with tests and reviews, I have to say the "S" looks to me as though it:
1. improves slightly on the FL in the corners at far distance at the 70mm end, and at close distance at the 200mm end
2. Does a little better in general close up and at wide apertures than the FL toward the long end.
3. Focuses closer at the short end, close enough to forget about primes unless macro or you absolutely need the 1.4 or 1.8
In other words the few weaknesses the FL has are corrected. But the FL for me was a very big improvement on the VRII, to say nothing of earlier models.
Presumably the S also shares with the FL the greatly simplified construction, which for the FL yielded for LensRentals a tripling of the average duration between repairs relative to the VRII.
A fair assessment?