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 FujiFilm S2800HD and Pentax K-5 II side-by-side from the front, back and top in their relative dimensions. FujiFilm S2800HD has external dimensions of 110 x 74 x 82 mm (4.33 x 2.91 x 3.23″) and weighs 437 g (0.96 lb / 15.41 oz) (including batteries). Pentax K-5 II has external dimensions of 131 x 97 x 73 mm (5.16 x 3.82 x 2.87″) and weighs 760 g (1.68 lb / 26.81 oz) (including batteries).
Below you can see the front-view size comparison of the FujiFilm S2800HD and the Pentax K-5 II. FujiFilm S2800HD is 21mm narrower and 23mm shorter than Pentax K-5 II but it is also 9mm thicker. As you can tell, actually this is not a fair size comparison since FujiFilm S2800HD has a built-in lens but Pentax K-5 II doesn't. Once you put a lens on K-5 II, its thickness will increase significantly.
Here is the back view size comparison of the FujiFilm S2800HD and Pentax K-5 II.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
FujiFilm S2800HD is significantly lighter (323g ) than the Pentax K-5 II 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 K-5 II, the total kit will weigh much higher.
Weather Sealing
Thanks to the weather-sealed body of the K-5 II, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to the S2800HD.
LCD Screen Size and Features
FujiFilm S2800HD and Pentax K-5 II's LCD screens have the same diagonal size of 3.00 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.