35.0X Optical Zoom 35.0X Optical Zoom of Canon SX40 HS will give you a lot of flexibility considering this will be your only camera during the day.
Medium size Body With relatively smaller body compared to DSLRs and better ergonomics compared to Compacts,Canon SX40 HSis a good compromise between size and functionality.
600g Carrying this weight all day may not be very comfortable for you.
Body Thickness 108mm With a thickness of 108mm,Canon SX40 HS is not a pocketable camera for sure.
Small 1/2.3" (6.17 x 4.55 mm) sensor Canon SX40 HS's small sensor struggles in low light situations compared to larger sensor.
No RAW shooting capability RAW files contains much more color information compared to JPEGs, and gives you more room for post processing without significant quality loss. They provide wider dynamic range and option to recover shadow and highlight clipping to some degree.