Its not very fast - but its fine for most things. If its portraits, then the odd bit of a hunt for focus doesn't matter. If it was for gigs, then you may get irritated at times. But, its a while since I've had my hands on a 1.8 (see sig) but my impression is that the 1.4 is better (ie faster) than the 1.8 at locking on.
it's not that fast at focusing - i tried a 24-105mm f4 L lens in slow light with the 50mm 1.4 and the f4 has the edge when it comes to speed of focusing
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