This is not normal even if there is the typical corner sharpness problem with all compact cameras.
I have a canon Ixus 40, and at wide angle 35mm, it has only slight softness at the 4 corners. Even if I don't like the softness, I can still crop a little bit off the 4 sides and still get a good photo.
For your case, the softness has invaded too much into the photo at the right hand corner, more than the other 3 corners, and this is unacceptable. :nono:
I have no idea why someone can say this is normal and accept the result as it is. How to take photo with this kind of defect?:nono: Unless you treat it as a "lensbaby" effect.:bsmilie:
Go and get it fixed at Canon.