My 7D Mark II has AF issues or something worse (such as sensor shake) that will make almost every image soft.
I'd say that 90% of the people who bought a 7dm2 know what they're doing, and if the pictures aren't sharp, something is wrong. My 7d2's image sharpness is way below my former 70D and even worse than a compact G1X.
I'm sending mine to warranty after 6 months of extensive shooting and blaming myself for shots being out of focus or just too soft. Since I can't afford to stay without a camera body for several days/weeks I bought myself a 5dm3 and the difference is night and day (i'm talking about daylight ISO100 shots at high shutter speed, the 7dm2 should nail those).
Basically all my shots now (using the 5dm3) are sharp and in focus, and I'm using the exactly same techniques I did with the 7d2. I really hope Canon recognizes the issues and takes the necessary measures to fix whatever is wrong. The firmware does nothing related to this, downloading it will not solve the issues.
I really believe there are many 7dm2 bodies out there with this issue. Check out this portfolio of a friend, her shots are amazing but for most of them it looks like they were took using mobile phone. This is NOT how it should be, there is no excuse for this softness except for a bad focusing or something worse. http://www.viewbug.com/member/lisalawrence
Whoever is blaming the users' technique for poor image quality probably never had a faulty body in their lives. I believe in user error for some shots, but when every damn shot is soft it's definitely something else.
Canon f***ed up badly on this one, this is supposed to be a top notch equipment and this rate of failure is not acceptable. I'm never buying any new cameras like that, from now on I'm waiting at least 6 months for the issues to show up and from there I'll decide if it's worth the purchase or not (7dm2 would be a no-no after some reading).
If I had to guess, I would say there is a major project mistake that causes the sensor to shake and this will cause a minor movement blur in every shot. In addition to that, the AF might have an issue as well caused by a different project mistake.