Oh, I will only buy the 4K Blu-ray version for new acquisitions, too, but I already own
Clash of the Titans on regular Blu, and saw no reason to upgrade being that I don't watch it that much anymore.
The 4K has HDR10+? That's cool; my Samsung display supports the format (it doesn't support Dolby Vision), and I only have one title with this HDR grading,
The Shining.
About the black levels: Unfortunately, I am running an edge-lit LCD panel, and this causes horrible flashlighting, bleed and blooming in letterbox bars of scope films, made even worse by HDR content because it pushes the contrast and backlight to max. So those great black levels of the
Clash of the Titans 4K disc would probably be lost on me...