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 Q10 and Canon SX270 HS side-by-side from the front, back and top in their relative dimensions. Pentax Q10 has external dimensions of 102 x 58 x 34 mm (4.02 x 2.28 x 1.34″) and weighs 200 g (0.44 lb / 7.05 oz) (including batteries). Canon SX270 HS has external dimensions of 106 x 63 x 33 mm (4.17 x 2.48 x 1.3″) and weighs 233 g (0.51 lb / 8.22 oz) (including batteries).
Below you can see the front-view size comparison of the Pentax Q10 and the Canon SX270 HS. Pentax Q10 is 4mm narrower and 5mm shorter than Canon SX270 HS but it is also 1mm thicker. As you can tell, actually this is not a fair size comparison since Canon SX270 HS has a built-in lens but Pentax Q10 doesn't. Once you put a lens on Q10, its thickness will increase significantly.
Comparison image of the Pentax Q10 and the Canon SX270 HS Size, Weight and External Dimensions - Front View
Now lets look at the top view comparison of Pentax Q10 and Canon SX270 HS.
Top View Comparison image of the Pentax Q10 and the Canon SX270 HS Size
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Pentax Q10 is significantly lighter (33g ) than the Canon SX270 HS 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 Q10, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Pentax Q10 nor Canon PowerShot SX270 HS 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 Mirrorless Cameras with Weather Sealing Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Pentax Q10 and Canon SX270 HS'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.