Great shots! Really like the last on there.
I have figured out the AF finally. It's absolutely flawless when the contrast is great, really really impressive! BUT in indoor light in the middle of the day I get almost nothing sharp.. I saw yesterday when shooting my daughter and a few rays if light in the window, whenever she had no direct sun I got nothing at all, but as soon as she had a little light/contrast on her it locked perfect. I saw the same outside, shot some houses far away and when they were in the shadows, but my no means dark and low contrast, it would front focus with several hundred yards, but if the same distance houses had more light in them, perfect every time.
So the great news is that focusing is not unstable and all over at all, in fact it's better than most L-primes I have owned. On a tripod and high contrast target it just can't fail.
The really bad news is that shooting with normal to low contrast it's really poor, so bad I took 23 shots in a row switching between Servo and One shot, I couldn't get ONE shot sharp of my daughter just standing in front of me.