You have to personally test that. (You should obviously do a blind test. When I did this I didn’t go all out and fired up R, but some statistical analysis would certainly not be overkill.) I can’t tell them apart but other people might.

It would be absurd, though, for me to buy CDs over AAC files because of the audio quality. Additionally to the indistinguishable audio quality I get a better price (I guess I’m paying about one third less on average), instant delivery wherever I am and the music is nice and compact. I don’t have to deal with boxes full of CDs.

Streaming doesn’t fit the way I listen to music (nor are any great streaming services available in Germany). I like my curated music collection.