Pentax K-x review
The switch to a CMOS sensor from CCD is presumably to allow HD video capture and Live View technology on the K-x. Another improvement that will have an impact on photographers is the new AF system. Instead of the rather basic five-point AF system, the K-x has the same 11 points found on the K-7.
Also inherited from the K-7 is the latest Prime II image-processing engine. This should have an impact on image processing and the speed of data transfer. In turn, Pentax has been able to increase the shooting rate in the K-x to an impressive 4.7 images per second.
A number of new in-camera image effects have been added to the K-x. A selection of cross-processing filters are available, but the most notable feature is in-camera HDR image capture. This creates a single in-camera HDR image by combining three different camera exposures. It is a feature I recently looked at in detail as a Feature in use when I reviewed the Pentax K-7 against the Nikon D300S (AP 17 October).
So while the Pentax K-x may have inherited its camera body from the K-m, there are a number of changes that have taken place inside the camera that should produce marked improvements in the K-x.