I have recently been able to rip the Japanese stereo SACD version and have already ripped the blu-ray surround streams to be able to play them and listen closely in the car. Hoping to do a close comparison soon! I don't have a way to listen to Atmos in the car, but did compare Atmos-fold-down-to-5.1 against the DTS-MA 5.1 version, and prefer the latter. As far as separation between channels is concerned; yes, it's not nearly as defined as mix done from discrete audio sources vs. an upmix, but the sound is very nice overall. Considering it's a progressive ROCK album, I'm ok with there being slightly less dynamic range as long as there is a bit of low-end kick that you can feel. The new box set mixes shine on this front.