I don’t have an answer for your main query, but
I heard The bad things About The 4k Transfer.
It appears the 4k is a case of too much DNR and edge enhancement applied, to the point his skin here looks like it’s peeling all over the place and the subsurface scattering is gone (giving a “waxy look”) as you can see
https://caps-a-holic.com/c.php?a=1&x=614&y=302&d1=16927&d2=16944&s1=185107&s2=185498&l=0&i=16&go=1
Around and under her ear here doesn’t look right, does it?
https://caps-a-holic.com/c.php?a=1&x=147&y=295&d1=16927&d2=16928&s1=185109&s2=185147&l=0&i=13&go=1
Also in that last compare and this one you can see a brownish dinge to the 4k, which is another mark against if for some people…
https://caps-a-holic.com/c.php?a=1&x=531&y=179&d1=16927&d2=16944&s1=185169&s2=185505&l=0&i=8&go=1