The Leica M9-P has a CCD sensor type which is better than the MOS sensor type found on most MILC digital cameras that were released more than two years ago. CCD sensors produce high quality, low-noise images but consume a lot more power than CMOS sensors. CCD is the most common image sensor type used in digital cameras.
This digital camera's sensor type (CCD) is actually the best sensor type amongst all MILC digital cameras that are a similar age to the M9-P.
Amongst comparable types of digital camera the worst sensor type is MOS.
There are a number of other cameras that have a CCD sensor currently available which you might also want to look at including the Olympus SP-810UZ, or the Leica M Monochrom (£5,798.00) which has better reviews.