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 Pentax K10D and Sony S980 side-by-side from the front, back and top in their relative dimensions. Pentax K10D has external dimensions of 142 x 101 x 70 mm (5.59 x 3.98 x 2.76″) and weighs 793 g (1.75 lb / 27.97 oz) (including batteries). Sony S980 has external dimensions of 93 x 56 x 24 mm (3.66 x 2.2 x 0.94″) and weighs 167 g (0.37 lb / 5.89 oz) (including batteries).
Below you can see the front-view size comparison of the Pentax K10D and the Sony S980. Sony S980 is clearly the smaller of the two cameras. Its body is 49mm narrower, 45mm shorter and 46mm thinner than Pentax K10D. As you can tell, actually this is not a fair size comparison since Sony S980 has a built-in lens but Pentax K10D doesn't. Once you put a lens on K10D, its thickness will increase significantly.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony S980 is significantly lighter (626g ) than the Pentax K10D 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 K10D, the total kit will weigh much higher.
Weather Sealing
With its weather-sealed body, we believe that the K10D has a big advantage over the S980 which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Sony S980's 2.70" LCD screen is slightly larger than Pentax K10D's 2.5" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.