Good:
20MP full frame sensor.
Good relation between price/performance.
GPS tagging.
Straight forward operation.
Great AF operation even in low lightning.
Built-in Wi-Fi, iPhone and Android connectivity.
Bad:
No built-in flash.
Slow continuous shooting mode.
A bit outdated, since it was originally shipped on December 2012.
No external headphone jack.
Bottom line:
The 6D is a great full frame camera. It’s not the latest model out there but it’s suited for pro’s that need a simple and efficient camera.