Everything matters lah. If not why make high end models? If anything, the one behind the viewfinder (or LCD) matters most! 
Actually antacid is nt wrong.. Most cameras can take good photos.. After all, it's just playing with lights.. If u understand the equipment.. Can be creative to overcome those limitations.
But that said, why make life so difficult.. Better equipment offer flexibility, thus allowing freedom for one to 'express' themselves thru photos or capture that priceless moment for MEMORY

.. So why use ixus? Buy a DSLR!!! Oops.. Ermm.. I mean s100/G1x/LX5 or something liddat lah.. Haha