adamdea
You are not a sound quality evaluation device
Hi JohnYes, no further information. However, my experience of re-mastered releases of reasonably recent vintage classical music recordings (e.g., 1950s-1960s opera) is that sensitive modern re-mastering techniques can remove annoying defects from the time without introducing too much of their own signature; and can reveal remarkable elements hidden in the original recording.
I have, however, heard recent re-masters of 1950s classical music that IMHO go too far and either introduce their own signature or reveal defects that might better be left submerged within a benign noise floor.
But in non-classical music the DR database reveals a lot of level compression that to my ears is highly undesirable. So, IMHO it depends. You have to pick your sources carefully.
As a matter of interest , have you tried any of the Pristine classics -which employ according to the website quite a strong level of intervention on old recordings based on trying to restore/boost the missing frequencies lost by the original process. They have some real classics their books including the Furtwangler Tristan and his Rome radio Ring. The individual purchases are quite steep but it seems you can get the whole lot for £1k which has set my mind thinking....