Keep asking questions and show your work. That camera was an anomoly, it happens. Happy to hear it worked out for you.
Thanks so much & I didn't take any offense to the previous comment. I know that it might seem as if I had a knee jerk "blame the camera" reaction, but I did finally get the store owners to admit that something was off (after sending them more examples, including images they took themselves with 100% crops of the area in focus). They still wanted me to calibrate the lenses to the camera, but again, 3 lenses with the same issue points to the body itself missing focus.
I know not all will agree with the decision & that's OK! It was the right decision for me. I truly look forward to becoming more involved with this board---it has been a great experience so far!