Over at WPCentral forum, someone in possession of Lumia 1020 has posted some pictures comparing Lumia 1020 and Lumia 920 in indoor conditions. Seems by mistake he had white balance of Lumia 1020 set as Sunny which resulted in slightly orange pictures. But, anyways the 5 MP pictures from Lumia 1020 are pretty sharp even after being compressed to 500 KB output. In above comparison Lumia 1020 is on top while Lumia 920 is at bottom. There are many other pictures which can be seen here.
In case you want to see more full-size images captured with Lumia 1020, below is yet another link, where you can find many images captured with Lumia 1020 and posted by someone else. Here is one sample,
Click here for full-size images.
Via WPC forum Thanks Mica1 for the Tip!!