The 8 Plus adds some bonus screen, and some bonus features. Let's take a look:

Apple A11 Bionic processor with embedded M11 motion coprocessor

64 or 256 GB onboard storage capacity

5.5-inch multitouch IPS Retina HD display with 1920 × 1080 pixels (401 ppi)

Dual 12 MP wide-angle and telephoto cameras with ƒ/1.8 and ƒ/2.8 apertures (respectively), optical zoom, and 10x digital zoom

7 MP FaceTime HD camera with ƒ/2.2 aperture and 1080p HD recording capability

Supports fast-charge and Qi wireless charging

802.11a/b/g/n/ac Wi‑Fi + MIMO Bluetooth 5.0 + NFC