The Sony Xperia M5 is a follow-up to the middling Sony Xperia M4 Aqua, which on paper seems to fix many of the issues we had with that mid-range phone. There's more storage, more RAM, a higher-spec camera and a sharper screen. With an octa-core processor, 3GB of RAM, 1080p screen, water-resistant build, 21.2MP main camera and a 13MP front-facing one,...