Nevermind.. I kept searching and, while I didnt find the answer, I did find a link to blu-raystats.com, which I had never heard of. The answers are there.
But - followup question, I notice that on that site Mission Impossible Ghost protocol is listed as 2:35:1, but on my 2:35:1 screen, I still have some black at the top and bottom when I am exactly at the edges of the sides. So that tells me it was actually put on the disc at higher than 2:35:1. Is the data wrong?
That blu-raystat site is cool. I did a feature search and filtered the aspect ratio just so see how many titles were in scope. There are a TON of 2.40:1 and 2.35:1. I also couldn't believe how many older movies were shot SUPER wide. How the West Was Won says 2.89:1! WOW.