Design
The big thing about the iPhone X was that it was a completely new design. Featuring a glass front and back, the iPhone X comes in two colours - Space Grey and Silver - and features a polished stainless steel frame around the edge that shimmers and catches the light in the same way the stainless steel version of the Apple Watch does.
Display
The Super Retina display measures 5.8-inches on the diagonal and offers a 2436 x 1125 pixel resolution for a 458ppi pixel density.
One of the big changes is a switch in aspect ratio to 19.5:9. At the time, LG used 18.7:9 and Samsung 19:9 so these are all pretty much in the same ballpark.
There is also a significant increase in resolution. The 458ppi leaps ahead of the 401ppi that you'll find on the iPhone 8 Plus. What does this mean in the real world? It means more detail is crammed into the screen to make things sharper and look better.
That's not only for viewing photos, but it enables crisper text and graphics, smoother curves and generally, more scope for the iPhone X to show off the other major change in its technology: the OLED panel. It's not the highest resolution on a smartphone, though, but still has a great quality to it.