On the bright side, at least you\'ll get an almost perfect hit rate for Autofocus at F1.4 since it\'s contrast detect vs phase detect.
Plus since this is only an APS-C lens and much smaller than the Sammy or even the Sony on the camera, I don\'t think its unreasonable for edge performance to be meh.
I frequently get focus errors even at F2 on my Contax G 45mm. Focus peaking is accurate about 75% of the time.