Intel Core i7 6850K 's Advantages
Higher base frequency (3.6GHz vs 3.4GHz)
Lower TDP (140W vs 150W)
Intel Core i9 12900KS 's Advantages
Released 5 years and 11 months late
Integrated graphics card
Higher specification of memory (4800 vs 2133)
Newer PCIe version (5.0 vs 3.0)
Larger L3 cache size (30MB vs 15MB)
More modern manufacturing process (10nm vs 14nm)