Its not possible to compare raw images for SL1 and 60D on the digital picture web site, just jpeg images, which means very little, since they were processed in camera with different firmware.
However, DXO has tested the raw output of the T5i which has the same sensor as the SL1, and found no change in raw output compared to 5 year old sensors from Canon. That's a more telling statistic than comparing jpg's on the digital picture.
Are you sure they share the same sensor? From what I read at launch, the T5i has the same sensor as the T4i, and the SL1 was something new. Maybe I had it wrong though.