Intel is pushing its partners a lot to develop detachable tablets and hybrid ultrabook like laptops especially with 13 inches or less. Last year, we Sony churning out Duo 11 and this year, they surprised us with much improved Vaio Duo 13 which is not only thinner but more powerful than its smaller version, Vaio Duo 11.
The Vaio Duo 11 had chiclet keyboard, similar to the ones found in Macbook Pro but the keys were slightly smaller and had longer stroke. Duo 13 has bigger keys which are much easier to type on.
Duo 13, obviously has a bigger display, although both pack full HD 1920×1080 pixels. That said, the Vaio Duo 11 was easier to hold in tablet mode as it had slightly more rounded corners. You can check out Duo 13 review at slatereview website.