I used my new/used K3-III at a few high school soccer games. The first thing I noticed is that the larger body (compared to my KP) pairs nicely with my Sigma 70-200/2.8. I really like the grip on it. Here are the settings I was using for the soccer games:
Continuous auto focus
Altering the Auto Focus Active Area between Expanded Area Small, Select and Select(S)
AF Area Restriction = ON
1st frame action in AFC = Focus,
Action in AFC = auto
Hold AF Status = off
Action when AF fails = Drive Lens
AF Point Tracking = Type 1 (Uses the AF and AE sensor to track AF points)
Subject Recognition = ON,
AE Metering = Multi-Segment
Face Priority AE = On
Link AE and AF Point = ON
My first game was during a bright afternoon with plenty of light. I noticed a dramatic difference in the autofocus compared to my KP. I don't know how to describe it other than it felt like it was focusing more quickly which resulted in more keepers. The greater frame rate was noticeable as well. I have a lot of figuring out and testing to do with all the various settings. I'll have to keep notes on the settings I'm using to see if I can determine a difference. I didn't notice a difference with the changes in AF Active Area settings but it's hard to notice that kind of thing while shooting. I did have a few shots where the first frame was in focus and then the very next one in succession was out of focus. I assume with AFC it was hunting for focus and missed it but not sure why.
For the poorly lit night game it did have some troubles focusing, especially since our team jersey was black, but it was definitely better than the KP. The ISO got pretty high and there is visible noise in many of the photos. I think it partly depends on where on the field the photo is taken where there is better light and of course how close the subject is to me.
Below is an example of where the first photo was in focus but the next one was not. I'll include some other photos in the next post.