The sony lense is a f2 - f2.4, while the canon is a f3.5 - f5.6 (i don't know the quantaray), that means if you shoot at tele, a difference of 2 f-stops.
To compensate, the canon will need to use a shutter speed 4 times slower than the sony.
Try to boost the ISO, or buy a brighter lens (the 50mm f1.8 is a very good lens, and also a cheap one, but won't be useful if you are far from the scene, it's also a fixed lens, no zoom here).