1. Big difference in subject colors
2. Images are not sharp
3. I think images are having a trace of green (something like that)
4. See my DSC-W5 result @ From my village garden and I doubt IXUS 115HS can ever give such results
I remember having a DSC-V1 some time ago- also capable of great,crisp natural looking shots- and used the same sensor as the W5..!