Well SD PQ softening affect has now been confirmed as a fault and requiring a firmware update in the next release, see other PQ thread or link below for statement.
Toady - should address the slight SD affect you referred to, I have a softening affect on my Sony TV so this will help me as well. It has not affected everybody only some, but at least the cause has been found.
http://community.virginmedia.com/t5/...ty/td-p/500443