David Niven

Shout! Factory uses MGM's HD master and mono mix which sounds similar to their 2004 DVD mono. They sound nearly identical aside from volume differences-except that the sound effects seem a bit flattened again on the DVD and this Blu-ray mono mastering seems to be EQ'd a bit differently.

Kino Lorber 4K Blu-ray fixes ratio issue due to new scan but has no original audio, only remixes. The MGM and Shout! Factory Blu-ray use the same HD master with stretched image and horrible muffled processed to death mono. The PCM mono on the MGM letterbox LaserDisc reissue is the only untouched original mix audio and sounds incredible.

4K restoration from Original Camera Negative

The steelbook reissue adds a more nuanced Dolby Vision HDR grading compared to the original UHD. The UHD is also the first ever release of the original four track stereo mix in a discrete presentation without any major processing. It is far superior to the existing 5.1 remix which was a bit modernized. The Atmos remix is laughably overdone and not at all befitting a film of this era.

Indicator Blu-ray > Kino Lorber see DVDBeaver 

Indicator is using a different restoration from earlier Kino Lorber Blu-ray and it has much better contrast and slightly better grain resolution

New restoration is completed

Universal Blu-ray better, MoC over-sharpened https://forum.blu-ray.com/showpost.php?p=19993011&postcount=53