Originally Posted by pers1
Many movies soundtracks are mastered from either 5.1 EX or dts-ES and are now released as 7.1 on blu-ray.
Here are a liste over BD's and Audio used.
http://price-adjustment.com/BLURAY-audio

I guess it depends on how you define many. Compared to all releases, 7.1 titles are few and many of the titles are not current releases. Studios have gone away from 7.1 in more current releases. They did more when the format was new.

mw