While there are a myriad of graphical upgrades, there are a nearly equal amount of control and camera updates as well. (gamingtrend.com)
I have watched multiple reviews, everyone mention that the main camera picture quality is average and a recent camera update made it better. (phonearena.com)
Specifically, the Denim that shipped on the 830 didn't have all the features Microsoft promised, like the Lumia Camera update with rich capture and fast start. (mobilesyrup.com)