Anything you can find from Olympus in reasonable good shape for the Pen F SLR will be top notch, it was among the absolute top 3 camera systems back before 1970.
I have 3 lenses for mine : a medium zoom, normal and a short tele, of these I value the short tele the most for its absolute biting sharpness (which can be said for the other two also, but the short tele is very handy).
I miss a decent wide and need to go hunting I think.
My only gripe is that the lenses, in order to be very compact (design feature of the entire system), has limited f-stops, but modern 35mm film, which has more than double the ISO for a given grain size and sharpness range, has more or less fixed that, its easy to get good results with the system.
I documented an old, and nearly forgotten graveyard this spring, and it was an eyeopener, going on and on on a single roll, 72 images is a LOT with conventional film photography.
I scan my negatives, back in the day it was a fortune to have the film developed and printed!
Erik