With my XT1 the 60mm was originally very slooowwww, however with FW 4.0 a couple month's back it is now much better. Its still not a speed demon, but its OK.
More importantly, I love the IQ from this lens - my copy is sharp, contrasty with beautiful rich colours (other people call it the 'Zeiss' look and I agree with them), and nice bokeh. In terms of overall IQ for my lens collection, I'd put it second behind the magic 35/1.4. For me, I would only pay the extra for the 56/1.2 if I was sure I needed the faster aperture or was shooting in low light.