I have an 810, a 1020 and a 1520. All three have features that I really like and some I dislike. If a 1030 would bring me:
* The battery life of the 1520 (or at least close to it.)
* Enough processor speed to shoot decent video and speedy burst photo shooting
* The hump (as this helps a lot to not drop the phone while holding it, I actually find it quite brilliant just for that reason, but it also makes the 1020 stand out, gives the phone character.)
* Xenon flash
* OS featuring three rows of tiles, like the 1520. (This would be fine on a 5" display.)
* AMOLED!! (The 1520 display is nice as long as you don't compare it to the 1020 AMOLED, even though the resolution of the 1020 isn't as high as the 1520 display, it is SO much better. The 1520 is much more blurry (well visible with for instance white on green background text), black is definitely poor compared to the 1020.)
I would definitely buy it.
I am not too fussed about more than the already amazing 41MP of the 1020. Sensor size is very okay too. Only the focusing distance, as has been mentioned is a little issue. I love shooting macros and this is not the strongest point of the 1020 optics. Sensor wise I think it leaves nothing to be desired, it is more than sufficient.
SD card slot I would definitely like to have, as it is an isolated partition of memory, and I like to take specific playlists of music with me for certain occasions. It is also a cool feature for storing various "Here" maps on to.