Announced by Sony in September, the QX10 and QX100 lens-style cameras are especially made to be paired with smartphones (they even work with Apple’s iPhone), turning them into more advanced cameras. The QX10 costs $248, featuring 10x optical zoom, while the QX100 costs $498, offering a very large 1-inch 20.2 MP Exmor R sensor with Carl Zeiss f/1.8 lens and 3.6x optical zoom - these are DSLR-like features.
As for the Xperia Z1 Compact itself, this should be released around the world starting early February, costing around $500 unlocked. Our Sony Xperia Z1 Compact review shows that the Japanese company really nailed it with this handset. It seems to be the best mini smartphone released until now - and it’s no wonder, since it’s as powerful as the larger, critically-acclaimed Xperia Z1.
source: Sony Japan (translated) via XperiaBlog