Personally, I think it's all overblown [though should be reported]. Cheating on benchmarks was extremely common in the days of heavy competition in the PC era. It went on in the mini-computer world before that. I take this as a sign that the computing world has gotten interesting again! There is now real competition or they would not be bothering to cheat! As always, take benchmarks with a grain of salt and when available use multiple benchmarks.
The first two articles are about the same scandal, the second of the two is very detailed:
Samsung caught optimizing its phones to score higher on benchmarks
AnandTech | Looking at CPU/GPU Benchmark Optimizations in Galaxy S 4
This next is what caused me to revise the Clover Trail+ chip greatly downward on my Arm vs Intel Benchmarks page.
ARM Beats Intel With Revised AnTuTu Benchmark | EE Times