HTC One M8

Apple's iPhone 6 may have enjoyed a blistering start during its first few weeks on sale, but it still faces stiff competition from other high-end handsets available across the industry, and if you're still on the fence with regards to which device best suits you, then you've probably been reading a lot of specs sheets. But while a big, beefy processor should keep things running smoothly and with great fluidity, the real-world speed can only be determined by using a device to perform a multitude of day-to-day tasks, and in the most comprehensive speed comparison to date, we get to see how the iPhone 6 stands up against both the HTC One M8 and Samsung's flagship Galaxy S5.