I gave "God Only Knows" a critical listen in Atmos. What I noticed was the very distinct and separate percussion section in the beginning of the song, the bells and wood blocks clearer and more distinct than I ever heard in a stereo mix. The richness in the vocals and then the highlight is the richness of the various voices singing the "god only knows" harmony in layer upon layer. That might have been where Giles introduced more of the height channels, as the vocal pitches go higher in scale he might have lifted or stacked the vocal objects higher in the mix but they never got higher than about a foot above my front speakers. Definitely a nice use of the sound stage though.
Giles describes the Atmos mix better here:
We can recreate that realism, if you like. That’s why I’m saying it’s not a psychedelic record—it’s a very real record. There’s the sound of air being pushed through lungs, and wind going through instruments. There’s a beauty to all of that.
That "realism" is what I am describing as distinct and you REALLY notice it on vocals, that realism.