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 E90 and Canon G15 side-by-side from the front, back and top in their relative dimensions. Pentax E90 has external dimensions of 102 x 59 x 25 mm (4.02 x 2.32 x 0.98″) and weighs 145 g (0.32 lb / 5.11 oz) (including batteries). Canon G15 has external dimensions of 107 x 76 x 40 mm (4.21 x 2.99 x 1.57″) and weighs 352 g (0.78 lb / 12.42 oz) (including batteries).
Below you can see the front-view size comparison of the Pentax E90 and the Canon G15. Pentax E90 is clearly the smaller of the two cameras. Its body is 5mm narrower, 17mm shorter and 15mm thinner than Canon G15.
Here is the back view size comparison of the Pentax E90 and Canon G15.
Now lets look at the top view comparison of Pentax E90 and Canon G15.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Pentax E90 is significantly lighter (207g ) than the Canon G15 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Pentax Optio E90 nor Canon PowerShot G15 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 Compact Cameras with Weather Sealing
LCD Screen Size and Features
Canon G15's 3.00" LCD screen is slightly larger than Pentax E90's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.