I'm looking to getting a Canon VIXIA HF20 for my first camera, but I was also looking at the possibility of the Canon VIXIA HF S100. The two, from what I can see, are identical with the exception of the CMOS chip. The HF20 has a 1/4" chip, while the HF S100 is 1/2.6". What I'm wondering is how much of a difference this might make to video quality. My understanding is that a large chip usually means improved quality, but would it make enough of a difference to justify spending an extra $130.