I have just tesyed my cd copies of dave brubeck qiartet "take 5" (columbia) and "what's new" (telarc), and "late night bruneck" (telarc) against spotify and tidal.
Results are always consistent.... Cd is either clearly better, or auguably better.
Always clearly better than tidal who pretends hifi, and arguably better (sometimes just not) than spotify who pretends mp3, which i despise.
I just got a deal with tidal, basically 3 months for free, and i am floored by how inconsistent the service is compared to spotify. With spotify, you know what you 're paying for and you end up surprised sometimes.
With tidal, you don't get what you are paying for, and sometimes, you feel it is worth something.
In other words, spotify delivers on the promise 100% of the time and more, wheras tidal sporadically does... A little bit like buying CDs before you can listen to them somehow.