That article is spot on for transferring 35mm film into digital, but this was shot at 70mm, which means you actually do get a benefit from going beyond 4k.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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I think mastering in 8K might be approaching diminishing returns, but it does prove useful for archival purposes.
http://www.soundandvisionmag.com/features/2880/the-truth-about-6k.html
That article is spot on for transferring 35mm film into digital, but this was shot at 70mm, which means you actually do get a benefit from going beyond 4k.