As noted above, music is often re-mastered for streaming, making direct A/B comparisons between those and the original CD's very difficult. Whether hi-res is audibly superior to to Redbook is still an open question in my own mind.
MQA is another whole can of worms. Many contend that MQA "folding/unfolding" is not a lossless process, and some artists have removed their catalogs from Tidal, because the end result was not to their liking. Tidal maintains that MQA content must be played back through proprietary MQA-licensed gear to achieve a complete sonic "unfolding".
I've personally opted to stream hi-res for my own system from Qobuz, rather than Tidal. Qobuz offers FLAC content quality up to 24/192 for many releases. Another streaming alternative is Deezer, which provides CD-quality content streaming. Subscriptions to both Qobuz and Deezer together can be had for less than the price of a top-tier Tidal subscription.
MQA is another whole can of worms. Many contend that MQA "folding/unfolding" is not a lossless process, and some artists have removed their catalogs from Tidal, because the end result was not to their liking. Tidal maintains that MQA content must be played back through proprietary MQA-licensed gear to achieve a complete sonic "unfolding".
I've personally opted to stream hi-res for my own system from Qobuz, rather than Tidal. Qobuz offers FLAC content quality up to 24/192 for many releases. Another streaming alternative is Deezer, which provides CD-quality content streaming. Subscriptions to both Qobuz and Deezer together can be had for less than the price of a top-tier Tidal subscription.