Share your experience!
I had noticed from official as well as unofficial forum that most of users facing same problems and they are not solved yet.. Please let me know if any mistake or change in my post.. Here is a list of features which must be included in Android 4.4 Kitkat Version..

a) Shutter delay must be reduce to capture moving images perfectly..
b) Low light image capture must enhance,, it gives noisy image.
c) Slow motion video.. Like z2
d) Z1 n Z2 has same cam technology then why Z1 can not record with 4K video recording,, It must have in 4.4 Kitkat
e) utilization of 20.7 MP in superior auto mode,, We use 8 MP res in Superior Auto mode.. It doesn't give option to use 20.7 MP for it,.
f) 16:9 ratio image capture is not supported by 20.7 MP res,, so it doesn't worth our camera
g) Front cam is not giving output as expected,, full of noise and polluted
2. Built-In Apps & Memory Management :
a) We are unable to moved our Games / Apps to external storage device.. i.e. MicroSD card.. Which causes memory shortage after installing 4 to 5 HD games; example - FIFA 14, MC4, Asphalt 8 etc..
b) Some un-necessary apps are built-in installed which we are unable to uninstall; they also holding memory which is totally wastage.. Please don't include those apps like : WeChat,, Hangout,, Line..
c) Please change default file manager i.e. "File Commander" to any other best or better than that file manager. My personally suggestion is to go for "ES File Explorer". Please let me other suggestions..
3. Sony Xperia UI :
a) At the menu view,, Why icons can not auto arranged..?? When i unistalled any app or game it will leave blank block.. why not the next
b) I am die heart fan of WALKMAN,, but when i see any 3rd party music player i felt that the output of walkman is awesome no doubt but why not it shows interactive UI like others have,, for Example : as shown in following pic ---
also if we want to change skin/theme of walkman.. it will be great change if it comes.. this change is not necessary or must not needed but also it will enhance UI of Walkman.. For example ---
/*4. Some add-ons - needed features - suggestion :
a) We use our lock key approx. 70 - 90 times a day,, due to this people face problem of lock key i.e. it becomes soft or have to press very harder etc.. So why not sony brings a "DOUBLE TAP / TAP-N-HOLD WAKE UP" feature which will reduce use of lock key..
b) Whenver mobile works unconscious we have to restart it properly,, so after presses and hold lock key it gives only option to "Power Off".. So here we want one small as "Restart" to reboot device.
c) At the time of call disconnectivity or call is active and to do some operation on device,, we have put mobile aside for 2 - 5 sec after then it will on the back light.. i really hate this.. So please do some to enhance auto-backlight feature..
d) When we unmount the external storage device i.e. MicroSD card.. it will 1st shows us notification that time we can mount SD card again and having no problem to detect it but if notification is been cleared then we have mount that SD card and must have to restart device to detect it.. So please do some enhancement in this also..
5. Over Heating Problem :
We know Over-Heating is a hardware problem,, but also sony can do some changes to control over heating.. For example - ' A background thread / program which monitor the temperature of CPU and must have to disable CPU cores automatically which are not necessary or not in used at that time.. ' it is just example there may have many more option to control the over heating problems..
If any one is having any extra suggestion or any other problem related same topic u can post your comment or PM me i can add it in my post..
IF DO AGREE WITH THIS POST PLEASE HIT "ME TOO" AND PRESS "KUDOS".
Apps,games cannot be moved to micro SD card.It is not possible in Xperias.
that means now i can't install more than one game without uninstalling previous game..??
so panthetic... :'(
Unfortunately,only by rooting that can be done.And rooting voids warranty in most of the cases.
i bought this a month ago aprox. now what should i do..?? 
Try to remove apps you do not use from internal storage to make space for games you want to install.
i dont keep any unnessary app... excpt that built-in app which i unable to uninstall..
You cannot install so many games at once,try to have only some.Keep your videos,images,music etc on the SD card so you have the internal memory free for games.
i had already moved my all pic, vid n music to my sd card,,,, i had installed only 4 games which i am playing daily and some nessary apps.. will u please bring any update for this..?? 
I am not working for sony and I am not a developer.But you could contact xperia care and suggest them,even though it might not be implemented:
http://www.sonymobile.com/global-en/support/contact-us/