The camera is going back to B&H on Monday and Adorama is shipping me a new one over night on Monday and if UPS delivers on Tuesday (Veterans day) then I'll have it then and I have that day off as our baby sitter can't watch our daughter that day so hopefully I do get it then!
I'll keep you updated. I'll also mess with the MA this weekend just to learn and see if it really does help but I doubt that it will.
Also - shoot in different conditions... get out and shoot in the day, see what the 7D2 does. It seems like your samples are all shot in low-light which, again, is where AF notoriously struggles.
I agree but in the same setting with the 7DI it worked fine... I did take some photos last weekend outside and the same problem happened, 1 out of 3 were out of focus.
I know you don't want to hear it again, but I don't think you should be using the 7DI as your point of comparison. Cameras are different and vary from system to system - especially models that are removed by 5 years. That said, you may still have an issue with yours, and an exchange will demonstrate whether or not that is the case.
Moving forward, I do not think you should be afraid/concerned with MF adjustments. I've never had a camera body that worked consistently with 100% of my lenses until MFA was performed. It's a painstaking/tedious process, but necessary for those among us who want repeatable/tack-sharp photos. Here is a good cut-out target you can make... https://dl.dropboxusercontent.com/u/29571216/MicroFocus%20Adjustment.v2.pdf
You need an angled and labeled target so you can determine if your MFA is in front of, or behind, your base condition. It's worth playing with/learning, so you can get better at it in the future. FYI - aim for the zero marker!