The sound review is absurd to read. If you're using digital connections like HDMI, the audio coming out of the BD player is literally passed through as the original bitstream from the disc to your receiver or TV lol. The receiving unit decodes it. Not the player.
The only possible time there would be a difference is if you're having the player downmix a surround track to 2-channel PCM.
Otherwise, a $10 player from the goodwill sounds as good as a $1000 player.
Who wrote this?? Any difference you heard is pure placebo, and if you understood the technology, you'd have already known that.
I bought the Sony UBP-X700 and its terrible. The freezing problem seems to be universal. Freezing on new 4k discs or old 4k discs and on both new and old blue ray media. The picture is very grainy and having to go in to turn Dolby vision on is stupid. Its about to be binned I would suggest you do some research before you go down the Sony route. The latest firmware update from Sony made matter worse.