Lumia 1020 is only a 4.5" screen. It does feel very "chunky" in the hand though. It's rather thick and has that camera "puck" as well. You might want to see if you can hold a Lumia 830. It feels much less bulky in hand, is more up to date and actually has a larger screen at 5.0" which helps when composing shots and editing photos/videos. Even though it is only 10MP it is full on PureView/Zeiss/OIS goodness and takes great shots.
IMHO, anything smaller than the 1020 with a great camera is actually going to be older still and probably less worth holding onto.