The MGM is the same master, and is dated as all hell we compared on AVS.
The Sony got a lot right but had the contrast blown out Ghostbusters style, it needs a new 4k master with no colour timing changes, as the Sony and the MGM/Criterion could not look more different
http://www.avsforum.com/t/1266651/robocop-1987-unreleased-sony-vs-fox-blu-ray-comparison-pix/60
Criterion upscaled overlaid with MGM/Fox disc
