The 13.3-inch MacBook Pro with Retina display has the same resolution as a 30-inch monitor. That's 2560x1600 for those who are not aware. This makes it a slightly higher PPI than the 15.4-inch MacBook Pro Retina, although the form factor isn't as impressive.
- USB 3.0: 2
- Video: 2x Thunderbolt, HDMI
- Ethernet: no
- Wireless: dual-band 802.11n, Bluetooth 4.0
You don't sacrifice a whole lot dropping from the 15.4 to the 13.3 — at least in terms of connectivity. There are still two USB 3.0 ports, two Thunderbolt ports, an SD card reader, a headset jack and an HDMI port.
Specs are a teensy bit milder. You get a dual core Core i5, rather than a quad core Core i7, and an Intel HD 4000 is left to power the display, as opposed to the 15's GT 650M. We'd have loved to have seen some discrete graphics in the 13 for further flexibility. You still get dual band Wi-Fi and Bluetooth 4.0 in the mix.