Apple's iPhone X sports an edge-to-edge screen, but it's not "all-screen," due to the notch on the top of the phone that houses Apple's TrueDepth camera system for Face ID. The Lenovo Z5, in comparison, is actually "all-screen."
Lenovo apparently figured out how to ditch the divisive iPhone X notch where the selfie camera and various sensors are found. It also appears that Lenovo has figured out how to eliminate the "chin" - the larger bottom bezel - that most other Android smartphones have adopted on their narrow-bezeled smartphones.
The chin is more out of necessity and technological ability. It's where smartphone makers can put the parts necessary for the display to work properly, and only Apple has figured out how to make a phone without a chin so far.
Indeed, the Lenovo Z5 looks to be a smartphone with a truly "all-screen" front surface. Check it out:
And here's another teaser of the Lenovo Z5 with incredibly thin bezels, but it doesn't necessarily confirm that the phone will be notchless. At the same time, Cheng mentioned in his Weibo post that the phone has a 95% body-to-screen ratio, which is considerably more screen coverage than the iPhone X's 83% body-to-screen ratio:
How they managed to keep a selfie camera and sensors on the front of the phone, as well as ditch the infamous chin, is still unknown. It also unclear whether the phone is in the development stages or whether it's simply a concept, according to CNET, which first posted the images of the Lenovo Z5.