For me, the strength lies in the new scans that significantly upgrade the picture quality from older blu-rays that did not receive a 4K scan. As far as HDR, lends itself well to Argento’s visceral visual style with scenes designed to shock As well as Argento’s focus on colors popping in scenes, like in Deep Red.
The best things to keep in mind with 4K releases: 1) Source material will help still dictate the way the film presents on your home theatre; 2) These films are not going to look the same as modern 4K releases like Battleship or Pacific Rim, which have that super crisp digital look- which is fine by me. I have an appreciation for both older and newer films on 4K.