I just got my 8/500 N (for a good price, 200€) and shot a few images in Nantes/France to test it, with my D500.
Here are some of them...one compared with the 4/300 AFS (first, not VR-PF)
In film days, 1984 or 85, I bought this lens new and used it with Fujichrome 100 / Tmax 400 and my FE2 or FM2 cameras...Alas, a lot of trash, specially the slides ! I sold it a few months after to buy an excellent 4,5/300 IF-ED that could be used with this slow films.
Digital cameras and high Iso capacity are a real revival for such a slow lens ! (All shots hand held, not always easy to focus, but dot focusing with D500 finder seems adequate).
1) 4/300 AFS (f:4,5 1/4000 s iso 400)
2) 8/500 N (f:8 1/1000 Iso 800 )
3) 8/500 N (f:8 1/2000 iso 800) St Pierre Cathedral Nantes
4) 8/500 N (f:8 1/1600 Iso 800)