Something's fishy

Today, Skid and I drove around taking pictures so we could compare the results (I have an S3 IS and he has an S5 IS). The biggest difference doesn't seem to be due to the cameras, though. We both had our UV filters and polarizing filters on our cameras. I took one of the pictures below with the filters on my camera and one without. The one without looks much better. Now we have to figure out which filter does what to the pictures.