One of the most impressive phones this year so far is undoubtedly the Samsung Galaxy Z Flip. But that's mostly because of its form factor and flexible display. On the hardware front, the handset isn't anything special and DxOMark's camera review is a testament for that.
The overall score reviewers gave the Galaxy Z Flip is 105 points, which isn't all that bad, for a phone launched in 2018, however. This score was just enough to put it right behind Apple's iPhone XS and XS Max - flagship phones from two years ago.
There's nothing inherently wrong with the cameras, though, it's just that competition in the premium segment has become fierce and it's not up to today's standards. The detail is rather low sometimes, ringing artifacts are visible, slow autofocus and the ultra-wide camera produces images with color fringing and fusion artifacts in indoor scenes.
On the other hand, dynamic range is wide, color rendition is good along with accurate white balance and noise is kept to a minimum. Video recording capabilities are also good by excelling in colors, focus and stabilization.