In reply to jamesclimbing:
Ok I have added a few pics to my flickr stream showing the sizing difference, I'm about 6'1" and 70-75kg depending on how many biscuits I've had. But I'm skinny with long arms
Both patagonia jackets are medium
Blue winter softshell over fleece and base layer
Grey mixmaster jacket
Orange simond jacket size large
Orange simond over blue winter softshell fleece and base layer.
Here is the link to the pics.
http://www.flickr.com/photos/99189686@N04/
Personally for the money I'm very happy with the simond jacket plus the £200 saved over the das Parker can go towards more climbing trips