I played around with the idea of getting this lens, or maybe the Sigma for quite a long time. As mentioned in the review, "that thick and stubby “prime” design" was very tempting too, but in the end I went with the Sigma (that was also before the Canon price drop). It may be a little clinical (the Sigma) but I happen to like the sharp rendering for night-time hand held photography. I retain the original 35mm f/2 for travel - nothing beats that compactness.
The attached shot was taken with the Sigma 35mm at f/1.8, 1/30, ISO2500 handheld (on a 5D MkII).
5D3, 5D2, Sony α6000, G16 | EF: SY14/2.8, V20/3.5, 28/2.8 IS, Ʃ35/1.4, 50/1.8, Ʃ50/1.4 EX, 100/2.8L IS Macro, 16-35/4L IS, 24-105/4L IS, 70-200/2.8L IS II, 1.4x II, 2.0x III, 70-300L IS, T28-300 Di VC PZD, Ʃ150-600 DG OS HSM S | E: SY12/2, 35/1.8 OSS, 16-70 ZA OSS, 55-210 OSS, SY300/6.3 ED UMC CS