Large APS-C (22.5 x 15 mm) sensor Large sensor in Canon 20Da ensures a good low light image quality compared to smaller sensor, and it also provide shallow depth of field and a nice blurry background when needed.
Large Body Even the smallest lens attached to this body will be a burden to carry everywhere with you.
770g Carrying this weight all day may not be very comfortable for you.
Body Thickness 72mm With a thickness of 72mm,Canon 20Da is not a pocketable camera for sure.