About a year ago I purchased my 1st projector, Optoma UHD 51A and a 135" 1.2 grade CineGrey 3D screen from Elite Screens and have been thinking about upgrading to this BenQ HT5550 model, but was not sure how much of an upgrade it would be from the Optoma model. I do use this in my living room, but I have curtains up and am able to get almost full darkness with those fully closed even during daytime. I have been enjoying the projector and screen (wanted a bigger screen, 4K and ability to watch in 3D after using a Mitsubishi 92" DLP rear projection for years). I have found that the Optoma projector does bright 4K HDR scenes very well (some of the shots in Planet Earth 2 and Blue Planet 2 are amazing) and 3D is great (I watch a lot of 3D movies, probably have over 200 3D blu-rays, so that is very important to me). The main place where I am not pleased with the Optoma projector is watching dark 4K HDR scenes, can be hard to see details and looks washed out (had to increase brightness). Looking through reviews it looks like this BenQ model looks like it should handle dark scenes much better than the Optoma one does, but was not sure how much of an improvement it will be. I know that the Epson and JVC projectors will do better black levels then this BenQ one since they are not DLP, but with all the 3D movies I watch, I think I want to stick with DLP.
So how much of an upgrade should I expect going from Optoma UHD 51a to this BenQ HT5550?