It will
most probably have the same screen as Oppo R11 which is a 5.5" Full HD AMOLED. I'm so very disappointed. This OP3 screen is horrible in VR -- it's slow, the pixels are huge, there's the glow that shouldn't be there...
It has 401 pixels per inch, which a bit lower than HTC Vive & Oculus Rift at
455.63 PPI which both felt way too pixelated for me when I tried them. I returned the Vive for that reason, VR content was not enjoyable at all. Samsung Gear VR with the S8 is more acceptable and with that I can see the stuff on screen better and I don't have to go very close to the objects like with Vive & Rift & OP3. The new Pixels should have 2K+ screens AND be faster to meet the Daydream specs, so I'll personally just wait for those and go test when they come out...
These HMD's for Windows Mixed Reality have screens that have much more usable PPI at 704.66:
http://www.tomshardware.com/news/acer-hp-windows-mixed-reality-dev-kits,34389.html
1440x1440 resolution, 2.89" size, 90 hz refresh rate..they're most probably LCD, though, not AMOLED, so it remains to be seen how good they are for VR/AR/MR.
TL;DR: If the OP5 had a 2K screen it would have 33% better pixel density which would vastly improve VR usage over 1080p. Better to wait for the new Pixels if you're like me and would love to use mobile VR
