Beside the benchmarks showing their mobile SoC leading the market since their custom SoC (A6?) and being the first to 64-bit ARM?

The upcoming ARM A67 SoC evolution is expected to be behind Apple soon to be two year old chip: https://www.anandtech.com/show/12785/arm-cortex-a76-cpu-unve...

The amount of cash they have to buy and hire the best in the industry.