I'll keep this simple - Go see it!

Rating: 9/10 (18 January 2020)

Just got back from seeing this. Absolutely loved it! One of the best movies I've seen in the past decade.
My friend didn't rate it as high as I did (so it may not be for you) but I thought the whole thing was amazing. It is beautifully shot (settings, lighting, color). The one camera, no-cut technique worked perfectly with this story (unlike, IMO, the strange timeline overlay of Dunkirk). And it has many emotional surprises along the way.
Highly recommended.