I see in your tests, that you test wdr by having someone standing in a garage opening and inside the garage. Would it be possible for you to test how the wdr method used, and the manufacturers implementation of the method, affect a scene with the person in motion?
[UPDATE: IPVM has done such tests, see: WDR Camera Shootout 2015]
In scenes where some parts of the face is lit by the sun, the double exposure method sometimes makes the face look more like modern art, than a photo fit for identification. And sometimes different exposure times introduce motion blur. I understand that it is harder to replicate motion for each test, but at least for my application, which is identifying people entering trough glass doors, stationary targets are not very useful.