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, S90 | SY14 f/2.8, Ʃ20 f/1.8, 24 f/2.8, 35 f/2, Ʃ35 f/1.4A, 50 f/1.8 I, Ʃ50 f/1.4 EX, 100L Macro, 17-40L, 24-105L, 70-200 f/2.8L IS II, 1.4x II, 70-300L, 100-400L | E-mount: SY12 f/2, Ʃ19 & 30 f/2.8 EX DN, 16-70 ZA OSS, 55-210 OSS, Metabones SB | FT-QL, AE-1P | FD(n) & FL lenses