We've tested all the best smartphones – which is the fastest?

We've seen a boat load of enormously powerful phones this year, but just how fast are they? It's all well and good pointing to octa-core processors, but that doesn't always mean much when the dual-core iPhone 6S is such a reliably speedy performer.Benchmarks give us an idea of how handsets compare, but even those don't really reflect real-world performance. So we've done what no benchmark can - here at techradar we've taken five of the fastest phones of 2015 and tested them by hand.The Microsoft