If you are curious to see how the iPhones compare to each other in terms of speed, this video tests all of the iPhones and compares them against every previous generation. It includes the original iPhone, iPhone 3G, iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5S, iPhone 6 and the iPhone 6 Plus. This video shows them all being shut off at the same time, powering up at the same time, ran a Geek Bench test, and going to Reddit. The powering up test is interesting as the iPhone 5S powers on first, the original iPhone powers on before the iPhone 5 and the iPhone 4 powers on last.
Check out the video down below.