Thanks for the reassurance. They do look grainier (eg. the sky) and the photos don't seem to "pop" out as much. Though I'm just an amateur so I can't really put my finger on why it doesn't exactly look as good and maybe partly it's psychological. I read up on using noise reduction in Lightroom so I've been trying that. The "luminance" function does get rid of the noise though the image looks soft afterwards. These are all shots taken in the daytime so if I had used Auto, the ISO would have been 100 or so.