Also Cortex-A73 even isn't fastest in Cortex series anymore. It was used for example Snapdragon 835 (with some modification).
Latest Snapdragon 865 uses Cortex-A77 (with some modification) that is significantly faster than A73.
> Alibaba compared the chip’s capabilities with that of the Arm Cortex-A73, which is the foundation of Huawei’s Kirin 970 AI-enable mobile platform that was introduced in 2017.
Also Cortex-A73 even isn't fastest in Cortex series anymore. It was used for example Snapdragon 835 (with some modification). Latest Snapdragon 865 uses Cortex-A77 (with some modification) that is significantly faster than A73.