Quality didn't improve per se, what did improve is the algorithms and stuff that happen in auto mode most likely. You can already see, there are quite a few awesome pictures in the pictures thread post update. All the camera enhancements do is make taking photos on auto actually decent, oppose to hit or miss; now it's decent or awesome.
Just random shots out of my window and my desk. I think the colors are more true, before the update the blue was over saturated and the yellows orangish. Also my little Cooper S is now clearly in focus and that wasn't before.