See: http://smg.photobucket.com/albums/v313/RiceHigh/5Ds/40mm_Pancake/EF40STM/Do note that there is heavy asymmetric vignetting at the right side of my pictures which can be seen even when stopped down, although the effect is not as dominant.A quick comparison to another previous brick wall test by another user of the same pancake lens found that the asymmetricity can be found on his samples, but
