I really like this, Matt - the tones, the angle, the colors - the more I see of this small lens, the more I love it. Am curious - do you remember what aperture more or less you took this at?
I usually set it f/4 when out and about (a shortcut to zone focusing with such a wide lens on such a small sensor); so it's either that or f/2 which I often use for close-up shots - the distance was about 20cm (0.6ft). Looking at the image again (rather than my spotty recollection of what I did) and sharpness fall-off, I'd say it was wide open.
And yes, this lens is surprisingly good as well as lots of fun to shoot with - it's much more versatile than its super-wide angle would suggest. It's also close to rectilinear at medium to far distances, which is a fantastic feat for a 7.5mm lens. Even close-up, distortion is easy to correct, and rendering is quite pleasing to my eye. Set to f/4 or f/5.6, you can use it set to zone focus and get consistently usable shots - it's very simple to use that way. It still pays to focus for any subject closer than 1.5m (5ft.) or so, regardless of aperture, though.
M.