If you can't take great pictures on any DSLR produced in the last ten years by any manufacturer, the problem is not with the camera.Someone is angry!
I suggest you stick to taking you cat photos with your flawed 6D mkii and leave the adults to taking real photographs with their equally flawed 'other Canon' cameras that subtract all the 'niceties' of the Nikon you aspire to.
We are not arguing about if one camera is bad or not, we are fixated on degrees of specialized excellence, and in this case, a rather specialized use (ultra-high megapixels) that for those who want/need it is a great thing, while forgetting that this is just one camera and that there will be others that follow with different configurations.
I know we all want to have "our camera" released next, but that just is not going to happen. Wait your turn and be happy for those that this model is aimed at, and while you wait, please enjoy some cat pictures taken with a flawed 6D2