The Dual ISO pics look somewhat plasticky and lacking in detail, like they'd undergone pretty heavy NR. Looks like a hefty price for lower noise
Yes, a lot of things in the image look much cleaner but ... sometimes textures are "clean" and lock plasticky in reality. I miss some cleanliness in a lot of images I make with the 40D which has quite good IQ just in comparison to current models.
For me it looks naturally smooth and I would like to have the option for such a processing of stills - might be a reason to buy a 7D.
It would be great to have a photograph for comparison ... or the couch ...