Intel Core i7 8665U 's Advantages
Released 3 years and 7 months late
Higher specification of memory (DDR4-2400 vs DDR4-2133)
Larger memory bandwidth (37.5GB/s vs 34.1GB/s)
Lower TDP (15W vs 45W)
Intel Core i7 6820HQ 's Advantages
Higher base frequency (2.7GHz vs 1.9GHz)