It's not the case. The light output is still dispersed over the entire 16:9 frame (or actually the entire 4:3 frame, unless you have an anamorphic lens). A 2.35:1 movie will look identical in quality to a 16:9 movie, just smaller.
|Originally posted by Greg Matty|
I was trying to convince myself that a 2.35 aspect movie will look better than a 16:9 since the same light output is concentrated on a smaller picture but I no longer think that is the case.