The Limey 4K UHD (1999)

[Geoffrey Firmin]

Originally Posted by cirik

If you correctly tonemap UHD to SDR/Rec. 709, then French BD and UHD are quite similar in terms of color grading.

But this is not the case in those UHD screenshots from dvdclassik.com.

That's not fair, it is true to say that there are some differences between the media players in terms of management of color space convertions. One can easily highlight this differences by using a BT 2111 test pattern: it can be download at this link in HEVC, the BT 2111 ( HDR 10/ BT 2020 test pattern) is explained by ITU at this link. Play the HEVC stream convert to rec709 sdr, made a capture with your media player ( VLC, MPC/madvr, 5K player, DVDfab 6), analyse the colorbars pattern with XnView and you will see that none of them is accurate to tonemap BT2020 HDR 10 to 709 SDR, with 5 or 6 points disparities on secondary colors ( yellow, cyan, magenta). But in any case, that could explain the huge amount of red (30 points !) difference between the BR HD and the UHD on that shot:
French HD
French UHD
UK HD