Your question is too broad for a forum answer. You basically are asking how to shoot a feature using a digital camera for theatrical release (workflow, exposure, post-production, etc.)
Generally a theatrical digital master would be 2K or 4K RGB, often in uncompressed 10-bit Log DPX files, and a version color-corrected for P3 color space would be created to make a 2K or 4K DCP (Digital Cinema Package.)
Cheaper and somewhat less good would be to finish the project in 1080P HD video and use that to make a theatrical version. And there are all sorts of quality levels of HD -- I'm talking about something at the level of HDCAM-SR, minimal compression, 4:4:4 color, 10-bit Log, etc., not some consumer grade of HD.
All sorts of lenses are used to make movies, old and new, good and bad, depends on the look you want for the movie. Movies don't have one look.
Best exposure, assuming you want a fairly low-noise image, is whatever minimizes clipping from overexposure but also avoids noise from underexposure. Since different cameras have different sensitivities, there is no one way to best expose all of them. If you hire an experienced cinematographer, he should know how to expose the image for the quality you want.