Dunkirk

Yes. The vast majority of Dunkirk was shot on IMAX cameras, whose 70mm film has a theoretical resolution of around 18k. Of course, current digital post-production and mastering can't achieve that resolution, so the footage was scanned at an already staggering 8k. The twenty percent or so of the remaining scenes that were not shot on IMAX but on 65mm film were then scanned at 6k. What's more, even the digital effects were done in 6k, though they are kept to an absolute minimum in the film.

All of this adds up to material that surpasses any Hollywood production in terms of the amount of visual information. In addition, Christopher Nolan has let it be known that he personally oversaw the creation of the Ultra HD Blu-ray, and for this release as well as most of his catalogue titles, he made sure that HDR was used correctly. Considering the quality of the analogue material that the Ultra HD Blu-ray takes from, it's no surprise that the disc is aiming for the absolute top of the benchmark materials.