Most of these laserdiscs are close to the original Dolby Stereo/Mono/etc but those Cinema DTS are exactly what you heard in the theater. No argument about it.

...ehr, can I correct this statement?

The Cinema DTS included in our BD project is not 100% the same of the one heard in theaters, just because it should be converted from 44.1KHz to 48KHz in order to comply to BD standard. Said that, I think we could affirm that it's still 99% closer, and that's more than enough to me.

Obviously if someone decide to make an MKV/MP4 file, and the player reads properly the track, this will be 100% the same.

I want to add a thing: the only 100% laserdisc track that could be used for any DVD or BD(AVCHD) project is the Dolby Digital one, as it's 48KHz even on laserdisc; the PCM should be converted from 44.1 to 48KHz, while the analog could be captured directly at 48KHz but due to its intrinsic nature, it will be not a 1:1 copy as intended in the digital domain; still, a very good quality track!