I totally understand the draw of the 40mm pancake, but I don't think it is a good lens to start with.
The Canon 35mm IS USM is a much higher quality lens and very close to the focal length of the 40mm, thus I would recommend the 35mm IS USM instead.
I.e. http://www.dxomark.com/Lenses/Compare-Camera-Lenses/Compare-lenses/(lens1)/1086/(brand)/Canon/(camera1)/0/(lens2)/966/(brand2)/Canon/(camera2)/0
The Canon 35mm IS USM is a much higher quality lens and very close to the focal length of the 40mm, thus I would recommend the 35mm IS USM instead.
I.e. http://www.dxomark.com/Lenses/Compare-Camera-Lenses/Compare-lenses/(lens1)/1086/(brand)/Canon/(camera1)/0/(lens2)/966/(brand2)/Canon/(camera2)/0
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