Smartphone go head to head in our comparison review HTC, Samsung and Sony have each unveiled their fl agship smartphones for 2014 in the One M8, Galaxy S5 and Xperia Z2 respectively. With three brand-new and very stylish Android handsets on the market, which should you buy? We compare the Samsung Galaxy S5, HTC One M8 and Sony Xperia Z2 spec for spec to fi nd out.