Easy fix I suppose. I've had my F30 3 Series for almost 3 years now and it's never once suffered from condensation in the headlamps (Xenon cluster) but I have seen a few X3s with a little mist in the corners. I guess I'm mostly curious as to why I've only seen this on BMW X3s and what's changed from the other models.
Not really a big problem in the grand scheme of things though, eh!