CED audio is comparable to analog LD in some ways, but the nature of the format means discs can wear down over time and develop playback issues. Later stereo players added CX noise reduction.
Here are the specs from cedmagic.com
Audio Signal-to-Noise Ratio: >50dB (USASI), 70 dB (with CX)
Audio Bandwidth: 15KHz
Stereo Separation at 1KHz: 26dB
Dynamic Range Mono: 50dB
Dynamic Range Stereo: 70dB

I’m not sure why some Thorn/EMI Beta titles don’t have Hi-Fi indicated on the cover. Any title released around or after 1983 should have it though.
Here’s a Thorn/EMI beta of Volunteers from 1985, and you can make out the Hi-Fi on the back.
https://www.ebay.com/itm/Volunteers-BETA-Tom-Hanks-John-Candy-Rita-Wilson-1985-Thorn-EMI/392118623440

On the flip side of the same coin, I’ve seen the Hi-Fi logo used on Laserdisc covers. 😉