That probably has more to do with the LCD vs AMOLED screen when using white backgrounds, but I'm sure the battery helps as well.
So you went from a 1020 to 830? Other than battery improvement, how do you find the performance?
I'm still usign the 1020 and I've been contemplating going to the 830 or the 1520, but the 1520 has been discountinued so I'm not even sure I could get it anymore. The 830 is on my carrier already so it would be an easy upgrade, but I'm hesitant to do it depending on what phones may come out in 2015.
Battery life isn't that bad on my 1020, I still get a full days use with relative ease, but it's the general performance I'm looking to improve. The loss of the camera would be tough, but it sounds like the 830 isn't too bad.