Hans your choice makes perfect sense for someone who wants one computer to do it all.
I want a tablet/laptop replacement that's easy to travel with.
Have you ever tried using a 15" Macbook Pro in an economy airline seat?
It's also IMO a bit heavy to put on my lap and surf the web while sitting on the couch.
On the other hand I won't replace my 30" HP IPS panel with a 15" Retina display.
I like to preview 16"x24" prints at 100% size.
It would also be hard to put 3 - 1TB data drives and a 256GB OS drive in a Macbook Pro.
I have modified the original article with these images.
A Macbook Air at various viewing angles.
A Sony Duo 11 at various viewing angles.
The Sony Duo obviously is worlds above the Macbook Air viewing angle wise. This is IMO important in a highly portable device.
The Macbook Retina would be similarly excellent in this respect.