Size and weight are big decision factors when you are trying to find the ideal camera for your needs.
In this section, we are going to illustrate the Olympus E-620 and Panasonic SZ10 side-by-side from the front, back and top in their relative dimensions. Olympus E-620 has external dimensions of 130 x 94 x 60 mm (5.12 x 3.7 x 2.36″) and weighs 500 g (1.10 lb / 17.64 oz) (including batteries). Panasonic SZ10 has external dimensions of 99 x 60 x 30 mm (3.9 x 2.36 x 1.18″) and weighs 177 g (0.39 lb / 6.24 oz) (including batteries).
Below you can see the front-view size comparison of the Olympus E-620 and the Panasonic SZ10. Panasonic SZ10 is clearly the smaller of the two cameras. Its body is 31mm narrower, 34mm shorter and 30mm thinner than Olympus E-620. As you can tell, actually this is not a fair size comparison since Panasonic SZ10 has a built-in lens but Olympus E-620 doesn't. Once you put a lens on E-620, its thickness will increase significantly.
Here is the back view size comparison of the Olympus E-620 and Panasonic SZ10.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Panasonic SZ10 is significantly lighter (323g ) than the Olympus E-620 which may become a big advantage especially on long walking trips.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on E-620, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Olympus E-620 nor Panasonic Lumix DMC-SZ10 provides any type of weather sealing in their bodies, 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 DSLR Cameras with Weather Sealing Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Panasonic SZ10's 3.00" LCD screen is slightly larger than Olympus E-620's 2.7" screen.