Here is an interesting post on Audigon discussing the superiority of 15ips 2T tape SQ versus vinyl or digital:
https://forum.audiogon.com/discussions/reel-to-reel-machine-for-15-ips-playback
All I can say is; IMHO 15ips 2T tape can have the best SQ of any medium, albeit at a stupid price. For example, Lyn Stanley London With A Twist, or Norah Jones Come Away With Me, both these recording, and others, make people think they are listening to live music in my home, that good! Why do you think a lot of high end equipment manufacturers are using R2R tape to demonstrate their products at audio shows?