hello, sorry if this has recently been asked, i did have a quick look in the search function but didn't throw much my way. Any way, I'm looking to buy the Optio S4 as i like the size and simplistic design it has. However i have the concern that the 4MP version may have lower picture quality than its 3MP identical twin (the S). i say this as i read a review on the Casio Exlim 4MP which had a grainer picture quality than the 3MP version. Im looking to be able to print large prints of my photos, and obviously would like 4MP to be able to do this without loosing picture quality (ideally up to around A3) cheers in advance for any help.