[Nick Zwar]

Years ago, we did some sound quality comparison with MP3 and CD sound (via FLAC), and I remember the differences were clearly audible, though not immediately obvious and not the same for all music styles. It was most noticeable in music that used few acoustic instruments, so stuff like very natural sounding chamber music, piano recitals, some jazz recordings (especially with cymbals). The difference became less noticeable with orchestral and pop music, perhaps because when there are fewer instruments, it allows to focus on certain sounds. I’ve never done that with high-res vs. CD sound, and I doubt I personally would hear the difference (if the mastering is identical, which it sometimes isn’t).
The majority of my music is from my own ripped CDs anyway, and there are digital downloads, of those quite a few are higher resolution, so I have music from 16bit/44,1kHz up to 24bit/192kHz. If I get to pay €8 for a high-res release from Qobuz (often with booklet), I choose that over paying €16 for the CD.