How can I tell if I am having a sensor issue with my A57 camera? I feel/notice at 100% images aren't sharp, and that my GF3+14mm is sharper. I haven't done a sharpness side by side with the same image, but just something I like noticed today. But, how can I tell if I am really noticing something or Im being too nit picky. I have a warranty still on my camera so I can send it in. Thank you.