Challenge accepted

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Well, you don't have ever used a F6, right? As someone who have used (and still seldem use) all the old legendary Nikons for years I can ensure you that there is a huge difference between these and the F6. Just to list some (and not all):
The mirror and shutter dampening of the F6 is so much better than that of all former Nikons, that it is indeed a league of its own (it is even better compared to the Nikon D3 and D4 introduced years later). The older mechanical Nikons have a very harsh and inferior dampening compared to the F6, resulting in more vibration. I can use my F6 with lower shutter speeds compared to the Nikon F, F2, FM and so on. Result: More keepers in critical situations.
The F6 has by far the smoothest and most refined, well designed mechanics of all Nikons ever made (and also surpassing the high-end models from Canon, Minolta, Leica, Contax, Pentax, Olympus). It is also by far the most silent operating Nikon. I have used it even in a church at a wedding. Not recommended doing that with a Nikon F, F2, FM, F3....;-).
I do a lot of portrait photography: In the summer, outdoor often with non-ideal lighting conditions, the F6 offers all I need for perfect shots: Extremely short shutter speeds (1/8000s) for perfect object isolation (best bokeh at wide apertures) and high-speed sync. for combining object isolation with perfect lighting and perfect contrast control (fill-in light by power-reduced flash). All that works perfectly with the F6 with its i-TTL and CLS system and SB-800 flash.
It doesn't work at all with the Nikon F. It is simply impossible with it (and all the other former Nikons).
From time to time I shoot weddings. Always with the F6. Perfect for that, no problems at all. Doing a wedding with a Nikon F? The keeper rate would be a fraction of that. The couples trust on me, they don't accept excuses like "oh, my old Nikon F is not capable of doing that". I need a system with a perfect keeper rate. The F6 is that system.
I also enjoy shooting wildlife: With the F6 I have a keeper rate of 80-95% (depending on the animals I shoot). In the past I've done wildlife with older cameras (when I started that some decades ago). I can tell you, the keeper rate was tiny compared to that I get now with the F6. There are lots of very good reasons why wildlife photographers have moved on to the more modern and more capable cameras with every new camera released. All those who prefer film in wildlife are using cameras like the Canon EOS 1V, Nikon F5 and F6.
The F6 has a 3D color matrix metering. The 3D function is very important (and works excellently) when using flash, and the color matrix works very well in "white-in-white" or "black-in-black" scenes. The difference in metering between the F6 metering and the metering in a F, F2 etc. is huge. Also in situations with strong contrasts.
I've shot more than 1.000 rolls so far with my F6. And I have never (!) had a completely ruined shot because of metering and exposure. In 99% of the situations I get perfect results. In the remaining situations the results are in the range of 1/3 to 2/3 off. That means even with transparancy film they remain very good (1/3 stop difference) to good (2/3 stop) difference.
That are just some examples why it makes a huge difference concerning keeper rate in using a F6 compared to the old Nikons. Professional photographers and experienced amateurs aren't idiots

. There are lots of reasons whay they have updated from the F to F2, than F3, F4, than moved to the F5 and finally F6.