Intel Core i5 6400 's Advantages
Integrated graphics card
Lower TDP (65W vs 95W)
Intel Core i7 9700KF 's Advantages
Released 3 years and 4 months late
Higher specification of memory (2666 vs 2133)
Larger memory bandwidth (41.6GB/s vs 34.1GB/s)
Higher base frequency (3.6GHz vs 2.7GHz)
Larger L3 cache size (12MB vs 6MB)