Sony NEX C3 vs Panasonic G3, Sony NEX C3 have APS-C Sensor that provides good dynamic range and less noise at high ISO, Panasonic G3 better movie mode compared to NEX C3, Read the comparison Review Below and decide yourself
Advantages of the Sony NEX-C3 compared to Panasonic G3: Sony NEX C3 features 16MP APS-C Sensor, the large size sensor of NEX C3 provides a better Dynamic range compared to Panasonic G3 Four third sensor. 25 AF point, with 25 AF(auto focus point) the focus of Sony NEX C3 is more accurate compared to Panasonic G3(23 AF point). Better ISO range, Sony NEX C3 ISO range is 100-12800 whereas Panasonic G3 ISO range is 100-6400, due to increase ISO range the Sony NEX C3 have less noise in low light condition compared to Panasonic G3.
Advantages of the Sony Panasonic G3 compared to Sony NEX-C3: Panasonic G3 have better movie mode, Full HD video recording at 60 fps, fast continuous shooting and features touch screen LCD.
Conclusion: Sony NEX C3 build for still photographers features less noise and better dynamic range, but if you want a a better video recording camera go for Panasonic G3.