A better test would have been to test performance in a CPU intensive task on two different but comparable SoC's with 4 and 8 core combinations and see if performance actually increases, Cortex A53 would be good for this as there are both quad and octa versions available.
Android is splitting the load over cores but is this resulting in better performance? Windows can manage tasks over multiple cores but if the applications are not properly multithreaded they're won't be much benefit to it.