My local AMC has both of these currently running Avengers 3D. First what a fun, great movie!! I will be seeing it all the way through with my buddy tomorrow but today by myself bought tickets to both theaters to try to pick the best one by watching the 1st hour and 15 minutes in each.
Damn....they are both great and it is really close. IMAX with dual DLP 2K (I believe in this plex) and the ETX had dual Sony (4K I believe) Both looked sharp with no registration issues.
Screen Size - very similar, not sure which one is bigger, but they are not typical cineplex size. Big! Almost as good as the "BIG" one if you can sit where you want which I was able to.
Sound - Both very good and can be very loud, some might want to take some protection for the loudest action scenes if you are sensitive. Slight edge I give to the ETX. Dialogue seemed a bit crisper, a bit better spacial with the surround and the deep tight base a slight edge as well.
Resolution and detail - Very close but slight edge to the ETX
Glasses - IMAX passive loaners, a bit larger than the realD pair they give you with the ticket. Both worked fine. Ghosting was not an issue with either.
Brightness - Too close to call and both with the passive glasses seemed to lose only about 30% through the lenses. Nice bright images.
Blacks & shadow detail - They both looked pretty darn good compared to what theaters used to look like, I was surprised. Slight edge to the ETX.
Motion - Slight edge to the IMAX with the DLP projectors, but the Sonys were not bad at all and most would not notice. Seemed closer than my RS50 and the edge my BenQ W7000 has on it. But some minor movement blur could be seen with the Sonys.
3D - Again both very good but here I would give a slightly bigger edge to the ETX Sonys. As someone said in a reply to Scott Wilkinson's review linked above the depth and overall quality seemed better with the ETX system.
I am picking the ETX venue for tomorrow's full screening.
Hard to believe we have two large screen digital 3D presentations now in the Burbank AMC 16 that are of the quality of these two. I wonder if they keep the IMAX now indefinitely. If the DLPs had been 4K each probably would have really upped the anti and made the IMAX hands down better than ETX.