With Super 35, though, they were still composing shots for 2.39:1. Depending on the production, they may or may not have protected the rest of the frame to be opened up for TV and home video.
The thing that kills me with the additional picture on IMAX screens is that it's a complete gimmick -- 1.85:1 has been a standard aspect ratio for theatrical exhibition for years, after all. Now, instead of one definitive framing, we have most major tentpoles having to compromise serving two...