Woah, interesting discussion going on here. I had no idea when I started this thread lol.
I like to think of these L lenses and bodies as suitable for professionals, but not perfect. I'm happy with the prices now without additional QC and cost. What I mean is the average joe with a bit of saving can afford the exact same system as the 'togs use on the sidelines at any pro sports game. Now think about movies. Independent film makers aren't exactly shooting with the same stuff as Hollywood, are they?
So anyway my issue isn't the body. Its my lens...
I discovered I can check the consistency simply by performing AF and looking at the scale on the lens. If I had thought of this a few weeks ago my shutter count would be a lot less
I let it focus in live view or MF and make a mental note on the scale of where it landed.
What's happening is at 50-70mm on the 24-70 its pretty much hitting the same spot on the scale every time it AF's. I lost count of good AF after 50 goes... Cool. Between 24-50(ish)mm 5 shots here, 1 there, 6 here, 1 there, etc... If the regular AF falls on that spot, all good. Which it does above 50mm.
For a minute I thought in horror maybe its my shiny new 7DMKII... So I got the 70-200 f2.8 IS II and performed the same test at 70 and 200. It mis focussed 1 out of about 50 goes. I can live with that, until someone comes along and convinces me that is not acceptable
I have worried about this for about 2 weeks, doing tests ad hoc time permitting. I came to this conclusion about an hour ago after spending a day at the zoo and in the back yard learning that under 50mm was bizarre.
So I can actually trust this body at f2.8! Now to find a good repair place, and a f1.2 lens haha...