Thanks for all the replies! I'm glad I made the decision to get the 6D now, wish I'd done it sooner! The first day I got it I set it up in no time thanks to Canon's consistency with the menu system. Feels right at home, except the joystick. I find my thumb goes looking for it during playback! The magnify button is handy, most of the time you just want to check focus anyway so I set it to actual.
The next day I tried out the wifi remote shooting. Not overly impressed with the EOS remote app itself but it works and as a remote release it might be useful for when the camera is at an odd angle. I hope Canon improves the app and adds more functionality like the CamRanger. Image review on the EOS Remote looked handy though (but no histogram??) will definitely get some use when traveling.
Looking forward to testing it out properly, including the GPS, at the weekend if I get a chance! I think I'm gonna love this camera!