As with their infamous 3 Dragons [14-24, 24-70, 70-200] Nikon has pioneered the cutting edge qualities of the medium telephoto zoom since the late 1970s. The 80-200 f4AIS (1981-1988) blazed the trail as it set a new standard in IQ on film; more than anything, this lens changed the mindset among Pros on the status of zooms. Back then, it was unaffordable for most of us, students especially
This MF classic is still rated as a top choice on the Nikon Df for good reasons. Nikon have bettered them ever since; first speeding the AIS up to f2.8, but especially as one of the focal Nikkors used to advance AF, VR etc. Many copies of these earlier AF models (notably 80-200 AfD) are still seeing active service on the front line 3 decades later. These things are built like tanks.
I've yet to handle the new S model but compared against prevailing build qualities the E FL is a stocky, very well built pro lens. My muscle memory also learnt its Fn controls for AF-ON+AF Mode on a D850.... Here's a Nikkor you can rely out there in extreme climes. It has to be so, when you consider the numbers out there earning $$$. [see the conservative sales on Roland's Nikon pages] The message here is the current fast FL and Z versions represent the significant investment over 4 decades of intensive R&D, not only in the optics but the quality.
As the 3rd party and OEM versions are all excellent optically, the differences across the brands hinge on focus speed, reliability and TCs. Since the expansion of the Z system over the past couple of months, the emerging consensus is the Z does better with TCs, and is far better that the F-mount combo with its TC2-Z. However, while I'm steer clear from using TC2 III on my copy of the FL, I have A0 prints taken with the FL @280mm (TC14 III) that speak more than any MTF. The rule is not to take liberties with subject distances. To try summarize this ramble, I'm keeping the E FL and saving for other lenses.