The F-series consists of regular SKUs that have the iGPUs disabled due to production line malfunctions, so they practically are Intel's equivalent to AMD's desktop Ryzen CPUs. Their CPU performance should be identical to non-F models, but each iGPU-less processor is expected to be at least US$25 cheaper than the non-F counterparts.
https://www.notebookcheck.net/Complete-Intel-Comet-Lake-desktop-F-series-lineup-with-no-iGPUs-leaks-out.454332.0.html