I've been experimenting with outdoor portrait photography and have been having issues with autofocus on my GX7. At first I was simply using shutter AF/23-Area to focus on subjects but have recently discovered the AF Lock button and have been using that along with Pinpoint mode. The camera seems to focus okay in good and not so great in medium/low light. I tried experimenting with face detect but it only seems to register faces 50% of the time. I have not tried using 1-area mode. Which AF mode do you find works best for portrait photography? Do you use AF Lock for portraits? When do you find it's best to switch to manual focus? Thanks in advance.