There are already 2 reviews out for the Sony HX7V.
Since the HX9V and the HX100V share the same sensor, firmware and processor and they are identical in many parts you can get a really idea how the results of these cameras will be.
here an ISO 800 100% lossless crop sample
The noise in the dark areas is very well handled the color and details are quite good.
For an ISO 800 on a tiny 16MP sensor Sony did a very good job here.
Sony HX7V 3x 1/30 sec ISO 800 no flash resized to 4MP color and sharpness adjusted
more at my blog hx9v.blogspot.com