The 901 is my waifu. The last and best sub-10 inch netbook. Still use one; didn't think anything could unseat it until the Pyra came along. But the Pocket looks pretty sexy - I've been waiting for someone to make essentially this product (a Macbook-esque EeePC) for ages. I have to say that I'm not sure I like the idea of a keyboard smaller than the 901's unless it can be thumb-typed. It's already a stretch. But I'd like to try one...
As for pocketability, I propose that cross-sectional perimeter, rather than area, is the correct metric. A pocket is a tube of fabric with a finite (and fixed) circumference.
Therefore, the scores:
Pandora: 2*(83+29) = 224
GPD Pocket: 2*(106+23.3) = 258.6
GPD Win: 2*(96+24) = 240
Pyra: 2*(87+32) = 238
Note 3: 2*(79.2+8.3) = 175
and for good measure
EeePC 701: 2*(6.3+1.3)*25.4 = 386
EeePC 901: 2*(6.7+1.3)*25.4 = 406.4 (I could only find the dimensions in inches and I don't have a tape measure - it's probably a slight overestimate because it narrows across the depth)
or, in order: Note 3, Pandora, Pyra, GPD Win, GPD Pocket, and EeePC a long way behind. Interestingly this is also the ordering of their longest dimension i.e. the depth of the pocket you'll need.
That's actually a massive portability upgrade for a netbook. It's only 2cm (less than 9%) bigger around than the Pyra. That seems pretty pocketable, if you have big pockets.
...brb, measuring my pants and jackets.