EF-M 18-55 IS STM vs EF-S 18-55 IS test
I have read some reviews where the EF-M kit is smaller, better(image and build quality) than EF-S.
Here is my test case:
Canon 60D + EF-S 18-55 IS I
Canon EOS-M + EF-M 18-55 IS STM
100 ISO, F8, 1/160-1/250 speed.
RAW + Lens correction.
100% crop, left EOS-M, right EF-S.
18mm, center(click for full size): http://g4.img-dpreview.com/6AA2059CAB4E488F8AA719C130293629.jpg
18mm, border: http://g3.img-dpreview.com/BA86C8EE53C44F0E9331276D42274744.jpg
55mm, center: http://g2.img-dpreview.com/B11C37E284D5469C8B849B80D7A41016.jpg
55mm, border: http://g3.img-dpreview.com/44887082F5B54184A1B5E2F66E1F39BE.jpg
EOS-M has better image quality(sharpness, aberrations).
In my opinion EF-M 18-55 IS STM is somewhere between 18-135 IS STM и 15-85 IS USM and this is impressive.
I have a test pics on 35mm/F8 and at 18, 35, 55 @5.6 and results are not very different - EF-M is better on every tested focus distance and aperture.
After the tests I have sold the EF-S 18-55, I'll use the M when I need a kit lens.
P.S. Could be interesting to test EF-M vs new EF-S 18-55 IS STM, but I don't have it.