Whatever the service, you will get the hi-fi quality only if the device you listen with is connected to a good hi-fi system, with a powerful amplifier and high quality speakers. Whatever the quality of the source if you listen on low quality headphones or on low quality system you will never feel Hi-Fi quality.
Personally I listen Spotify from my computer including a HQ digital soundcard connected by optical cable to a Denon Audio video system set in 7.1 with Top level speakers and 2 subwoofer and I can tell I am totally satisfied of the quality of sound.
SoundofusRock Star 19
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