The HX5 is not the usual compact fair we’ve been used to up to now.
The HX5 is the first proper HD Compact. A compact camera which does full HD video.
Under the hood, we have the IMX050 Exmor R sensor. See our article on the technology here. Right now, back-side illumination isn’t the huge leap some expected, but this technology will come into it’s own as sensors get even more densely packed. There is talk of 22MP in a compact for 2011.