Environmental Sealings For a camera that you carry everywhere with you, being weather proofed is a big advantage. You will have one less thing to worry about.
Large Four Thirds (17.3 x 13 mm) sensor Large sensor in Olympus E-1 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.
735g Carrying this weight all day may not be very comfortable for you.
Body Thickness 81mm With a thickness of 81mm,Olympus E-1 is not a pocketable camera for sure.