Thanks. The reflectiOn is alot less brIght than the sun would be otherwise ,which makes the dynamic range perfect for this sort of thing - this required minimal processing on the highlights and shadows.
I'd normally shoot in aperture priority wide open, or perhaps at f4 for this sort of thing to keep a fast shutter speed (the light levels are often changing and I have a lot more unusable shots due to camera shake than to depth of field).
That said, later that day I was shorting in shutter priority at about 1/400 to get round this, with auto ISO set.
The focus point was set once on the rear guys face using the AE/AF button, then I took a few frames based on that focus point. The autofocus isn't great on the Olympus though. I quite like the foreground being out of focus with the main subject sharp, although I see what you mean about the background maybe being sharper than the main subject.
It'd be a lot easier using the viewfinder/autofocus on my D700, but then you can't discretely shoot from the hip with an articulating LCD on a tiny camera with that.