HTC One E8 versus M8: What's the difference?

The HTC One E8 is upon us, and we've got our hands on the lighter, polycarbonate version of HTC's flagship targeted at Russia, India and parts of Asia. As we've pointed out in our coverage so far, the E8 is essentially the internals of the HTC One M8 in a plastic case with a different camera. But beyond that there are actually quite a few smaller differences to get to grips with. For...