Famed overclocker 'Splave' tried out a small experiment to find out whether the newly announced Intel Core i9-9900KF offered any potential advantages over the 9900K when it came to overclocking. The results showed that the 9900KF can go somewhat higher than a binned 9900K on liquid nitrogen. Although the sample size used in this test is small, it does offer an indication that the disabled iGPU in the 9900KF SKU could be useful in overclocking under extreme cooling.
https://www.notebookcheck.net/Intel-Core-i9-9900KF-could-offer-a-slightly-higher-overclocking-potential-than-the-9900K.414991.0.html