Martin Tai , Jan 22, 2010; 10:26 p.m.
I have Contax T2 and T3, no experience with G2.
If you are looking for something small, go with T3, it is smaller with a better recomputed 6 element Carl Zeiss Sonnar 35mm/2.8, vs 5 element Sonnar 38/2.8 of T2
The black titanium version T3 is un-obstrusive.
Both T2 , T3 are now rather cheap on ebay