http://www.hollywoodreporter.com/race/oscar-voters-brutally-honest-ballot-422546
I originally shared this three years ago, so yes the films in question have changed, however it’s still a really good insight into the thinking of Academy members. The voter here explains what they personally look at for each of the categories and clarifies some things like sound mixing vs. sound editing. It helps to give an insight into why some shocks do happen at the Oscars!