The Sony Xperia Z5 Premium has remarkably tiny pixels - the tiniest we've seen. They also don't run parallel to each other as standard LCDs but follow an unusual pattern.
The resulting pixel density of 806ppi is well above anything we've seen on a smartphone or a tablet too.
We used our camera to capture the way selected test images and videos look comparatively on the screen of the Asus Zenfone 2 (1080p), the LG G4 (1440p) and the Sony Xperia Z5 Premium (2160p).
We've cropped parts of the images to make it easier to compare. Just click them to see them in full size (our gallery has a 1:1 full res mode).
We started off with a 4K test image (courtesy of hifi-writer.com). The idea behind this image is that a 4K screen should be able to visualize all twelve thin lines (1px each) within each vertical or horizontal color band.
We could see more lines resolved on the Z5 Premium than on the LG G4, so this test brought us back the hope that we would be actually able to spot the 4K benefits with a bare eye.
Unfortunately, returning to any of the other test images we had ready, we could no longer spot any difference in smoothness or detail.
We shot a camera sample with the Xperia Z5 Premiumís own camera and we loaded it on all three phones to see if the image came out in greater detail.
Upon close comparison in the crops below you would notice that the textures on the Z5 Premium screen is a bit smoother, even though there isnít any difference in the detail to speak of. Unfortunately, this difference was not easily visible with a bare eye without any magnification.
The image we tried next is amazingly high quality. Itís a sample image taken by the Canon EOS 5DS and it is available for download off Canonís product page.
Unfortunately, loading up the images on all three phones, we couldnít spot any noticeable difference between the UHD screen of the Z5 Premium and the QHD screen of the LG G4.
Showing a tighter crop of the same 50.6MP image:
We finally shot a 4K video with the Z5 Premiumís own camera and checked out how it looked compared to the other phones. Again, the effect of smoother looking surfaces was visible under magnification, but not with a bare eye. There also doesn't seem to be any additional level of detail to noticed on the 4K screen.
Coming up with different ways of testing the Sony Xperia Z5 Premium screen left us exhausted but underwhelmed as itís hardly the technological breakthrough we expected. One can argue that even 1440p QHD screens are way too much for such small screen sizes as well. And they may be right, but want it or not, itís where the industry is heading these days even if itís all for the bragging rights.
These display hurdles aside, the Xperia Z5 Premium is shaping up to be an excellent smartphone and Sony really needed a flagship phablet to go along with its regular size phones. We can't wait to test out even more aspects of its screen and hardware. Be sure to check back with our homepage next week for a full review.