The dust question...

So does the dust removal system actually work this time?

It's certainly different. Whereas the K10's system was a noisy, low frequency wobble of the sensor which seemed well-intentioned but largely ineffective, this one is an almost inaudible ultrasonic vibration system. I have it set to perform at power up and so far so good.

It's not scientific, but so far I've not had to get the blower out once. I change lenses an awful lot and I'm fairly certain that by now I'd have had to clean the sensor on either the K10 or especially the *istDS.

Let's see how it goes on, but for now it's a thumbs up.