It's plenty fast on iOS. Benchmark it yourself if you don't believe me. Come back and post numbers if you dare
Apple is a full year ahead in hardware, because Qualcomm had an awful year:
I don’t think there’s any way to sugarcoat this, but 2015 has not been a particularly great year for Qualcomm in the high-end SoC business. The company remains a leading SoC developer, but Snapdragon 810, the company’s first ARMv8 AArch64-capable SoC, did not live up to expectations
Even the 820, which is better -- thankfully! -- is not even as fast as the old iPhone 6, much less the new 6s. And the iPhone 7 will be shipping in less than 6 months with an even faster CPU.
This idea that there is some magic in multithreading is just not backed up by benchmark data for typical apps outside of video encoding. If your cores are all slow, it doesn't matter if you have 24, 48, or a million of them.