Thanks for listening reports, and discussion! I will probably stick around with my NT-505 for a while, before an eventual upgrade. I still need to "get to know it" better, even after a year of use. This is so also because I mainly play music from LPs. As I stated above, there is still a considerable gap, in my system/to my ears, between the superior analog sound, and the not-bad-to-quite good digital sound. Some have found the 505 bright and glassy. In my setup, compared to the Lyra Atlas cartridge, it is not very bright, nor very glassy, but it is clear that the treble air and resolution is greater with the Atlas, and thereby, the "thereness" of the music. I find it somewhat surprising that the AKM chip should sound "glassy", but I will check it more, myself.
I agree with many other observations: yes, standard cd format through Qobuz etc often sounds surprisingly good on the 505. The hi res takes are maybe not so much of an improvement as one should expect (I get varying results),
DSD sounds best to my ears also, and for DSD, the best formula seems to be to keep as close to 'native DSD' as possible. So I have not experimented much with filters.