Sound was great on both versions. Wonder if folks could actually pick out the Atmos with a blind test... I doubt I could.We've discussed this so many times in the past and we are all aware of this problem. Definitely don't like it and just hope that K will come up with a solution soon. I must admit though that my Trinnov Altitude does miracles with the DSU so it's less of an issue for me personally.
With regards to Mamma Mia, I bought the HDR movie but I also downloaded the HD version that has the Atmos soundtrack and I watched it together with my daughter last night. Loved it and I highly recommend it. And honestly after comparing it with the HDR version immediately after there was no significant difference in the image quality. If you like ABBA's music and want to spend a pleasant evening it's worth the $20..... even in HD.....(my opinion).