I've been using an EOS 5D Mark II since late 2008. For the past few weeks, I've been using it alongside a new EOS 6D. Under the same conditions, side by side.
The plastic top of the EOS 6D has a weird texture that catches a LOT of dust. It seems like every piece of dust, dirt, or lint that comes near it will stick. And since they don't come off easily, they'll start accumulating unless I manually pick them off one-by-one with my finger. On the other hand, with a magnesium alloy top dust doesn't stick easily on my 5D2 at all. And if there is dust there, I can just blow it off easily whereas on the 6D I have to physically use my fingers to pick them off.
I only notice this because I find myself constantly nitpicking the dust off the 6D, something I never have to do with the 5D2 even though I use them side-by-side.
Anybody else notice that about their 6D?
It's not that I'm obsessed with keeping my 6D looking new. I'm more worried that those dust particles will find their way into the lens mount, and into my lenses. I've already seen the dust squeeze between the dials and buttons of the 6D, something I never noticed in the 4 years I've owned the 5D2.