The Intel Core Ultra 7 265KF is the objective winner of this comparison, securing victories in eleven out of fourteen measured specifications. Its most significant advantage over the Intel Core i7-8700K is its L2 cache, which is 2300% larger. While the older processor maintains a 62% lead in max turbo power, the newer model dominates the majority of the technical categories, establishing itself as the superior component based on the provided data.

Users prioritizing modern architecture and the massive L2 cache advantage should select the Intel Core Ultra 7 265KF for their build. Conversely, the Intel Core i7-8700K remains the appropriate choice for those specifically seeking the higher max turbo power provided by that older unit. Your decision should rely on whether you value the significant cache capacity of the newer processor or the specific power profile offered by the legacy hardware.