We were just discussing the merits of 2:40 screens vs 16:9 screens. It seems that now, with so many movies either doing IMAX aspect, 2.0, 1.85 etc and especially movies that switch aspect ratios, getting the widest 16:9 screen that will fit would be a better solution than a straight scope screen. Yes, wide content will have black bars, but you end up with the largest image possible for all aspect ratios. (as long as you can get the width from your projectors throw) The only drawback I can see is sightlines to the lowest part of a 16:9 image. But that can be somewhat mitigated by raising the screen to the highest you can get.
Using a scope screen it seems you give up a lot of size for IMAX enhanced, 2.0, 16:9 etc. Thoughts?