Intel Core i7 6820HQ's Advantages
Higher base frequency (2.7GHz vs 2.6GHz)
Intel Core i7 8850H's Advantages
Released 2 years and 7 months late
Higher specification of memory (DDR4-2666 vs DDR4-2133)
Larger memory bandwidth (42.7GB/s vs 34.1GB/s)
Larger L3 cache size (9MB vs 8MB)