ASUS claims color accuracy of delta-E<1 on all of their websites for this phone.
However, individual display tests done by Notebookcheck (link to their review) and GSMARENA show differently. Even the previous generation Zenfones have better color accuracy, going by their charts.
How does this affect a normal user like me?
I use my phone display as a second monitor to my computer while doing color work (as I did with my previous phone - OnePlus3), as I need to get my colors right on my photos/videos. Small fluctuations in what colors are and what they look like to me makes a huge difference on how someone else views my photos and videos.
Please look into the matter and resolve the issue, this is really crucial for some users.