Tiny
The camera almost seems dwarfed by the normal-size 18-55mm lens.
Top
With the exception of a stereo microphone, Canon manages to get all the same controls on the top of the SL1 as the T5i.
Back
To get the size down, Canon moved the SD card slot to the battery compartment (sigh), moved the focus-area selector and AE lock buttons to the side, and shrank all the back controls -- the navigation buttons are so small they don't even have labels.
Shallow grip
The grip isn't nearly as deep as the rest of the Rebel lines'.
Mic input
On the upside, Canon left the microphone input on the camera.
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