I swear by my 35L 1.4 as my primary lens for travel and walkabouts

BUT

You should wait for the Sigma 35 1.4 coming out soon, if it follows the same trend as the Sigma 50 1.4 - it will perform much better than the Canon cheap equivalent - which is the 35 f2, no idea how the new IS version has improved optics or not. But there is quite a difference between 1.4 and f2