I recall the days when we longed to see a "Reference Quality" Blu-ray; they were "few and far between," to be sure. Those "days" seem to be over; in fact, now it is rare to be placing a film anywhere but the top Two Tiers!
This one was PRISTINE (for the most part), with dazzling CLARITY (especially in outdoor, daytime scenes, which were plentiful) and astounding DEPTH (again, mostly in outdoor, daytime scenes). Night time scenes, or indoor scenes with low-lighting, featured rich BLACKS and finely-rendered SHADOW DETAILS.
DETAILS in general were superb! You could see every stitch in clothing; every nuance in foliage; every crack and stone in city streets; and the list goes on and on. The only disappointment was in "some" facial details, where there seemed to be a bit of smoothing on the female lead's creamy white face. But in fairness there were also some facial close-ups with excellent texture, including the female lead.
COLORS were bold and vibrant, especially (you know what I'm going to say
) in outdoor, daytime scenes, but not limited to them. These were on display during the majority of the first half. Once the scene shifted to London, with its rather gloomy atmosphere and night time bombing, primaries were less frequent, though on occasion they did blossom, yielding sufficient EYE CANDY.
In considering the placement for this film, the first half would easily be a contender for .5 in the Top Tier. The second half may not have fared as well, but it still had many "reference shots" and the less-than-stellar scenes were still worthy of the top of Tier Gold. My vote goes for....
Tier Recommendation: Tier 0* (.75)
PS I've heard the 4K version boosts the details, colors and depth up a notch, so I would imagine that would land in the middle of Tier Blu.