Glass definitely plays a part with achieving a cinematic look. Fast glass will open your lens up for better separation. Camera profile adjustments are also key as well.
I have invested in 1000x 64 GB cards for my cameras to make sure I never bump into the memory issue while doing a project like the one you mentioned above. That helps a lot with not worrying about the cards running out. I also ask the client if there is a mixer present that would supply the house audio so I could run a line in with a portable recorder like the H4N to have one solid audio file for post. This makes the process a little easier but you definitely should look for another camera op for help to avoid a headache.
If you have the money to go for a Neumann U87 definitely go for it. Mr. Selman also has a good recommendation with the NT1-A which is also more affordable if you are looking to go that route. Good Luck with your purchase.