KokoNigel, a lot of that was actually covered (with some back and forth) in this very thread, pages ~7-10.
Here’s a quite damning comparison. The blu-ray literally has a lot more detail than the 4k, lots of detail turned to mush 😦
https://caps-a-holic.com/c.php?d1=5240&d2=15006&s1=48928&s2=156526&x=665&y=172&i=16&a=2&go=1&l=1
And the more famous “detail death by DNR” compare that people were sharing