Canon New 24mm f2.8 EF-S pancake

[Chris2500dk]

Looks to be about the same size as the 40mm f2.8 but a more useful focal range for APS-C I think.
The New Canon EF-S 24mm f/2.8 STM Pancake

Still not a small camera but I don't think it'd be much worse than walking around with a A6000 with say a Sigma 30mm, or an E-M10 with a Sigma 19mm.
Compact Camera Meter

 

[RT Panther]

Great stuff for the diminutive SL1!

 

[CiaranReilly]

With the Canon SL1 or 100D this will make a great street photography lens, it'll be almost as compact as the Panasonic G/GH/Olympus E-M5 m43 cameras with the Panasonic 20!
(Edit: not quite but close!)

 

[Luckypenguin]

A Canon EF-S prime lens, wonders will never cease!

One of the benefits I found in moving away from Canon to APS-C and 4/3 mirrorless formats is that the new systems featured lenses designed specifically for the format. For anyone who stuck with DSLRs and found that moving from an APS-C to a 135 format camera too expensive or of minimal benefit, you were left using prime lenses designed for a larger sensor.

 

[tilman]

A Canon EF-S prime lens, wonders will never cease!

One of the benefits I found in moving away from Canon to APS-C and 4/3 mirrorless formats is that the new systems featured lenses designed specifically for the format. For anyone who stuck with DSLRs and found that moving from an APS-C to a 135 format camera too expensive or of minimal benefit, you were left using prime lenses designed for a larger sensor.

same with Nikon. If Nikon had offered something like this 2 years ago, I'd most likely still be their customer...