Firmware Version 1.1.7 is now available for the EOS 6D and offers the following fix:
Corrects a phenomenon in which when using the camera with the EF 70-300mm f/4-5.6 IS II USM lens, even if lens aberration correction is set to 'Enable', correction will not be applied.
Firmware Version 1.1.7 is for cameras with firmware up to Version 1.1.6. If the camera's firmware is already Version 1.1.7, it is not necessary to update the firmware.
To download the firmware update please visit, select 'EOS 6D' from the product list, click on the tab for 'Firmware' and follow the on-screen instructions: