The concept of utilizing full monochrome image sensor in a camera was initiated by the Leica M Monochrom, which was popular and highly regarded among black and white photography purists. Maxmax.com, a camera conversion expert is offering modified Fujifilm X-100s and X-Pro 1 cameras featuring true monochrome image sensors.
The logic behind having a full monochrome sensor is quite straightforward, by removing the traditional color filters in a typical RGB (red, green and blue) image sensor, the light will hit the image sensor at full spectrum, unfiltered, allowing the image sensor to collect full information with minimal losses. This translates to images in black and white which display greater sharpness, depth and clarity, hence the claimed superiority of utilizing a full monochrome sensor.