I didn't get a chance to compare the audio, but it's too bad what they did.However, I did compare a few scenes of the video...dramatic increase in PQ to be sure.
I never viewed the Blu-Ray with a decent sub-woofer. So with my dual 18 inch PSA subs, I was satisfied with the LFE since I had nothing to compare to.I thought the Atmos layer was very good.
Immersiveness was very good, but when you hear the LFE on the Blu-ray (or DVD), you'll be shocked at how different it sounds. Pop in the Blu-ray that came with the 4K and just watch the pod scene.