DPReview has completed their review of the Canon EOS 6D Mark II rather quickly and came away liking, but not loving it.
From DPReview:
It's true that every objective specification of the 6D Mark II has been improved upon when compared with its predecessor, while the release price has remained the same. Unfortunately, unless you're a die-hard Canon user with an investment in glass and you just need an affordable backup body, it's difficult to look past all that competing cameras have to offer…..
… As it should be, the EOS 6D II is a better camera than its predecessor in every way. With plenty of resolution, respectable burst shooting speeds and pleasing Canon color, it's a camera that's capable of producing great images in a variety of situations. Despite this, it is simply overshadowed by competition that is made up of more capable cameras at similar or lower prices. Read the full review
Just like most of the people that have used the Canon EOS 6D Mark II, it's a nice upgrade from the original, but may not compete all that well with competitors. Here's hoping we don't have to wait another 5 years for a successor.
At the end of the day, the camera will be judged by how well it sells. Casual consumers have a tendency to care a little less about certain specifications than us passionate gear nuts.