if you google differences between the 2016 HD8, and the previous version ( which we did while still waiting for a UK sale price)
they have upped some things, lowered others. e.g. more RAM, better battery life, alexa ready; but worse camera,
slower processor...
http://ebookfriendly.com/amazon-fire-hd-8-2016/
another review has this to say about the new camera:
It’s a sad state of affairs, but this is exactly the sort of camera I’d include if I was in charge of the Amazon Fire HD 8 design. A better but still remedial camera isn’t worth adding even £10 to the price of this tablet. The cameras are here so you don't have to give the kids your phone when they want to take pictures of the dog.