Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Panasonic GF1 and Panasonic GF2 side-by-side from the front, back and top in their relative dimensions. Panasonic GF1 has external dimensions of 119 x 71 x 36 mm (4.69 x 2.8 x 1.43″) and weighs 385 g (0.85 lb / 13.58 oz) (including batteries). Panasonic GF2 has external dimensions of 113 x 68 x 33 mm (4.45 x 2.68 x 1.3″) and weighs 310 g (0.68 lb / 10.93 oz) (including batteries).
Below you can see the front view size comparison of Panasonic GF1 and Panasonic GF2. Panasonic GF2 is clearly the smaller of the two cameras. Its body is 6mm narrower, 3mm shorter and 3mm thinner than Panasonic GF1.
Here is the back view size comparison of Panasonic GF1 and Panasonic GF2.
Now lets look at the top view comparison of Panasonic GF1 and Panasonic GF2.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Panasonic GF2 is significantly lighter (75g ) than the Panasonic GF1 which may become a big advantage especially on long walking trips.
Also keep in mind that body weight is not the only deciding factor when comparing two interchangeable camera bodies, you have to also take into account the lenses that you will be using with these bodies. Since both Panasonic GF1 and Panasonic GF2 have the same Micro Four Thirds lens mount and Four Thirds sized sensors, lenses will not be a differentiator on total size of the system.
Unfortunately neither Panasonic Lumix DMC-GF1 nor Panasonic Lumix DMC-GF2 provides any type of weather sealing in their body, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Panasonic GF1 and Panasonic GF2's LCD screens has the same diagonal size of 3".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.