I'm really blown away at the quality considering a raspberry pi camera module was used. Based on the green ribbon (as opposed to blue in the previous model) I'm guessing they used the second version of the camera module. This version uses a Sony IMX219 8-megapixel sensor [0] which is pretty much a smartphone camera. (it was also used on the Nexus 9) Though considering that the module costs around $20 it seems fair. (I usually just associate the RaspPi with "cheap")

[0]: https://www.raspberrypi.org/products/camera-module-v2/