For those new to the high-end media scene, a "Remux" is not a re-encode. It is a direct, 1:1 copy of the raw video and audio streams from the 4K UHD Blu-Ray disc, repackaged into a container (like MKV) without any loss in quality.
Reviewers at Blu-ray.com and High-Def Digest frequently cite Pacific Rim as a "reference-quality" disc. It is often the first movie recommended to showcase the power of a high-end OLED TV and a 4K player. Summary of the Viewing Experience pacificrim20132160pbluraycompleteremuxdv