My, new to me, Nikon F4S arrived this morning. There are a few bumps and scrapes and the LCD screen has a small bit of the dreaded "bleed" but for the most part it seems OK. I've loaded some Fujicolor Pro 160 C into it and managed to run off 24 frames. Tomorrow the rest.
It seems very smooth compared to the F2 and the F3. Almost as if there were no mirror flapping around in it. Quite nice.