The Sony Xperia XZ3 failed to impress the reviewers at DxO Mark and, strangely, it failed to best the score of the Xperia XZ Premium. Note: not the XZ2 Premium, but the first Premium phone from early 2017. In fact, the phone just barely beat the mid-range Xperia XA2 Ultra. Here's what went wrong. The XZ3 was praised for nailing the exposure and producing images with good texture and pleasant color. The photos can be rich in detail if shot in well-lit areas, but the camera doesn't like the dark. Autofocus gets slower in the dark - taking up to half a second! - saturation gets boosted too...