Mine is similar to anno's- it makes such a difference on a cold night not finding the entire duvet close to the bottom of the bed and me shivering under the cover on its own.
I think that mine is slightly longer- I have never had to think about it.
DH and I having debate over new duvet.....does stitching run up and down the bed or across? It's superkingsize so almost, but not quite square. One of life's mysteries.......