For both picture and sound, Revenge of the Sith (opening) Super 8 (train crash) Into Darkness (opening) Transformers 4 (opening) and pretty much any BD with a Dolby Atmos track (John Wick, TMNT, Hunger Games Mockingjay Part 1).
there is a DTS 2018 ULtra HD Blu-ray demo disc out from CES this year that some are selling on ebay .... the 2017 a tad cheaper.
but I mention this cause I seen its coming soon to a thailand retailer thus its likely going to hit other retail outlets (in other Countries) so be on the look out if interested.
I use a Dolby Atmos demo disc for sound and have a few for the 4k but love Batman V Superman especially the just before the fight scene with Batman standing in the rain