Lack of detail in dark areas is a known side effect of local dimming. Either you take a very bad picture or your TV shows it. Again, it's not a sleight, just I cannot watch TVs that use it, as I find said loss of details, lagging response and blooming big no-nos.
Some good videos in this link showing said problems.
http://uk.rtings.com/tv/tests/picture-quality/local-dimming
Also the following review of the 902
http://www.hdtvtest.co.uk/news/tx58dx902b-201604174282.htm
Again, all TVs have issues including my (apparently beloved) OLED which loses shadow detail too, although apparently the 2017 models fare a lot better. I'm currently dithering over an A1E, and if it is eventually bought, you will be glad to know that the Hisense will be going!