Compared with the original G1, the G2 has improved autofocus performance and higher top shutter speeds of 1⁄4000 sec in manual mode and 1⁄6000 sec in aperture priority mode. The manual focus wheel was moved from the top deck to the front, to about the same position as where the focusing wheel was located on classic Dresden and Stuttgart Contax Rangefinders. In addition, the G2 was made available in a black finish along with black versions of the TLA200 flash and 28 mm, 45 mm, and 90 mm lenses.
A new active auto-focus system has been added to the G2, which uses near-infrared beams to set the range. The G2 auto-focus also has two focusing modes: continuous, which constantly adjusts focus as the camera is moved; and single, which is a safety mode, focussing as the focus button is pressed (or shutter release half-pressed), and maintaining this reading until the shutter is released. If the camera fails to find focus in this mode, the shutter cannot be released.
For more info check here.
The Body, cap, strap, papers, and box.
Cosmetic: Overall good condition, with some signs of use.
Optical: Viewfinder clean.
Mechanical: All shutter speeds are accurate and all mechanical functions are working.
Electronic: All electronic functions are working.