Via Flickr:
Jessica looking seasonal at Leeds Castle this weekend. It's right on the border of what I'd post sharpness wise; probably too soft for most purposes. There's a neat set of lamps through the wood by the entrance, and it was too dark to shoot on other settings.
This is ISO 6400 on my 5D, recently upgraded to a MKiii. Whilst that would have been an impossible ISO on any other camera I've owned, you'll see you still have issues in terms of IQ. I have had sharper images at 6400, however so I suspect the focus was slightly off too, or one of us moved. You'll see ISO 6400, f2.8 and a shutter speed half the focal length (in Flickr's neat new display to the right), so there's plenty that could have gone wrong in terms of getting things pin sharp.
I might end up posting some others from this series, but I thought I'd start with one where the technique is a little off, but the atmosphere is on.
Hope everyone is having a great week so far.