I was using Nokia lumia only until last year, when at friends’ recommendation I bought Sony Xperia Z1 in December. The experience so far has been amazing. What I really like about the phone is that it is sleek and quick. There is absolutely no problem holding it in your hand.
Though I am not very much into technical details, but a few basic things that mattered to me were-
Availability of 16GB storage+ 2GB RAM
It is up-gradable to Android 5
The 20MP camera offers excellent picture quality
And, of course the 4.3inch display that makes using this phone all the more good
The best part- all these features come packed at a price so minimal. RECOMMEND IT!