But yeah, the SoC in the iPhone 5S was crazy fast at the time, plus they have other advantages like Secure Enclave, and a smartwatch with ACTUAL all day battery life. I owned a Sony phone with a Snapdragon 810, which was Qualcomm's first high-end 64-bit chip... and it overheated at the drop of a hat. The phone was more or less unusable in Australian summer. Everything I read at the time indicated that Apple really caught the rest of the industry off guard.
Even Wikipedia puts it pretty bluntly:
"The first 64-bit SoCs, the Snapdragon 808 and 810, were rushed to market using generic Cortex-A57 and Cortex-A53 cores and suffered from overheating problems and throttling, particularly the 810, which led Samsung to stop using Snapdragon for its Galaxy S6 flagship phone."