I bought a IIIf last summer and it has been my most used camera. I really, really love it.
I use it most often with a Summar 50/2. It performs beautifully with Tri-X, Acros and Presto.
I've found the Color-Skopar 21/4 to be a nice lens, especially for shots where I want to squeeze everything into the frame (in a good way.)
I also sometimes use a Nikkor-Q.C 135/3.5 but the two together make for a very heavy and conspicuous setup.
My IIIf is currently in the shop, but I hope to use it for many years to come. It's truly a wonderful camera.