This post is really more about the 1100D than the 50mm 1.4, but I thought I'd like to see how my daughter's 1100D compared with the expensive kit we use at Building Panoramics, so I stuck the 50 f1.4 on it and went down to the local show centre.
I have to say I was really quite impressed. The AF is very accurate, at least with the 50mm. In the PR 3 picture the horse is cantering towards me at about 350 metres per minute ( 13 mph ) and the camera was able to nail focus in servo mode at f2.8 time after time, 100% 'keepers'.
Despite the fact that the 50mm gives a FOV of 80mm on the aps-c I was surprised how difficult it was to try and blur out distracting backgrounds, even at f1.8 when compared with FF.
Anyway a very versatile lens. It has great 'brio'