The Descent (2005)

UK StudioCanal 4K Blu-ray or FR Pathé 4K Blu-ray share the same disc (caps)

The StudioCanal UHD has a much better encode than the Lionsgate UHD with the same grade. The Vuelta UHD has a decent encode but it is in an incorrect color space and has German overlays.

UK disc includes only 5.1.

The 7.1 mix included on the Lionsgate UHD appears to be identical to the 2006 USA BD's LPCM 7.1 track and to be a straight transfer of the theatrical Dolby Digital Surround EX mix (originally matrixed 6.1, with the rear surrounds in the discrete 7.1 presentation being dual mono). The old GER BD has a 6.1 mix but it is a poor remix and the GER UHD has an Auro-3D remix of the 7.1 mix (mostly adjusted surround levels). All other discs offer a 5.1 mix, including the Studio Canal UHD