Companies don't lower QC standards. They are written in company SOP and followed like a recipe word for word. That doesn't make any sense at all. Have you ever worked in a QC department?
No, I did not. But I wonder how you can say with absolute determination that qc standards are never lowered no matter what the company or market situation is, nowhere, globally. That doesn't make sense to me, if I may say so. But it might very well be that my speculation is wrong and the first samples of 24-70ii will be just like the ones later on.
Well, no, I can't do that. However, for a company as big as Canon, it would be unrealistic that they could take the time to purposefully lower QC standards when they are so large and handle so many manufacturing units. You'd be surprised at how robotic some of these people are doing the QC testing according to SOP. We used to joke that a monkey could do it and all you had to do was feed it peanuts every so often. No offense to QC personnel.