A stunning technical achievement that immerses you in the horrors of war like nothing else. One of Sam Mendes' best films, 1917 grabs you by the shoulders and does not let go for the duration if its runtime. Roger Deakins' breathtaking cinematography creates the illusion of a seamless, never-ending shot, and somehow gives equal measure to moments of mortal peril and quiet reflection without ever sacrificing narrative momentum.
See this on IMAX if you can. It's well worth the additional expense.