Sony claims its 2 600mAh battery also gives two days of running time on a single charge
and the M5 is powered by a 64-bit 2GHz octa-core processor mated to 3GB of RAM. Sony Xperia M5
Better cameras (back one only just), cheaper, slightly smaller (same res but 5 inches instead of 5.2), worse in every other way (power & battery life).