Nope I asked you a question, why do 'you' think that the 9900K will steam ahead as you put it, based on the fact that a 8700K (6c/12t is not fully used by GTA V) so a 9900K only really offers the extra boost clock speed, and once you hit 6 cores in GTA V extra cores add nothing, but IPC and clock speed will.
Let me ask you this, how relevant is 8 FPS or 12 FPS, or 14 FPS in a game that is 6 years old running at a resolution that is fast becoming outmoded, and is already hitting 170+ FPS?
I don't give a flying monkey myself, but I am sure there are niche edge case people that it matters to, and they will not rest until the injustice it rectified!