I own the KEF LSX II speakers and I can hear a slight difference in sound clarity between Spotify and Tidal in acoustic songs like i.e. "landslide" by "Fleetwood Mac".

Note that Tidal is supported via "KEF Connect" or while Spotify is available through Chrome Streaming, not directly IIRC.

Is it worth the big price tag? Not sure tbh. I don't play music very loud and I don't listen all that much outside working hours where my attention is elsewhere.