I actually think the default is too washed out, metal wise. It looks too much like ... it's hard to explain. Mind you this is entirely subjective, but it looks like there's too much noise on it. Noise is good, it breaks up the constant colors, but it looks like there's too much.
Fester, the first picture is really hard to look at (grainy) but look at the second one you posted. The fuselage has nary a ding or dent on it along the entire tail, and despite it being a tad blurry there's a pretty constant glare moving up to the cabin area (the Sun is towards the tail, going by the shadows, so maybe that's why it's not so reflective on the forward fuselage).
I've sat in many a plane seat looking out over the wing. I seem to get wing seats a lot. Despite the oil and grime and residue, the overall look is still that of a shiny surface. You can still see the color of the sky in it. You can still see light reflection. I've looked at some while waiting in airports as well and it seems the bulk of the "muck" is below, as it drips downward. I've recently seen some photos of a Super Connie's engine areas, it's a total mess. The upper surfaces seem fairly clean though.
Don't get me wrong, you wipe a white cloth on the surface it will come back pure black. However at the scale and size we're talking about you honestly can't see it. It's like the dust on your TV screen. You can have a watermelon load of it if you wipe a cloth over it, but when you're watching TV you don't notice it unless somebody draws a smiley face on it.