Intel Core i5 9600KF's Advantages
Higher base frequency (3.7GHz vs 3.6GHz)
Lower TDP (95W vs 125W)
Intel Core i7 12700KF's Advantages
Released 2 years and 9 months late
Higher specification of memory (DDR5-4800 vs DDR4-2666)
Larger memory bandwidth (76.8GB/s vs 41.6GB/s)
Newer PCIe version (5.0 vs 3.0)
Larger L3 cache size (25MB vs 9MB)
More modern manufacturing process (10nm vs 14nm)