Cheers. Just one more thought. I did use zone focus a lot.......and forgot it was on, (I had three cameras with me......and the 5d didn't get a look in!) a few of the shots fell outside of the zone but actually turned out well enough.Not at all, on the contrary most of them look great, very crisp. What threw me off was the couple shots that looked softer to me are marked as shot with an iPad in the EXIF on Flickr Originally I thought you'd mixed in a few mobile shots, but it just occured to me maybe those were just processed/uploaded from there and it overwrote the EXIF. In fact, could just be the different processing on those now that I look at it a 2nd time.
Side note, funny coincidence but I was just browsing 500px earlier and saw some shots someone else posted of a couple of the same protestors you encountered. Small world!