While a sound quality bump is welcome, Spotify just doesn't sound as good as almost any other service in my subjective comparisons. So as it is, my expectations are low when I use Spotify.
Today I updated my P1 to the latest firmware and played around with Spotify for half an hour.
To me it sounds pretty decent, just using the free version right now. I did switch back to Tidal right after, played the same songs, and it was better for sure.
Spotify sounds pretty good, and the total Spotify experience wins hands down for me.