We already know that Google had recently
launched its latest version of android device
known as Android 4.4 KitKat. There are number
of questions like what the main difference
between Jellybean 4.3 is? and how Google has
increased features and specifications. Here this
article tells about the difference between
Android Jellybean 4.3 and Android KitKat 4.4
versions.
The comparison between Android 4.3 and
4.4
Notification bar
The main feature of notice bar has been
changed, as in the past version of 4.3 Jelly Bean
it was in blue color, but now in the Android 4.4
Kitkat it has accompanied white shade symbols
like Wi-Fi, Bluetooth, and others will look like
same as 4.3.
Application Drawer
Some application symbols, for example, Google
Settings, Voice Search and YouTube are already
modified while new applications like Quick
office are currently local within Android 4.4
Kitkat that you are not able to find in Android
4.3. Apart from this, the Apps and Widgets tabs
are the similar and also the Google Play Store
symbol stays on its original location at the upper
right part of the application drawer.
Clock, Stopwatch and Timer UI
There is small difference between android 4.4
and android 4.3 stopwatch I.e. font size has
been modified and more centered in your
device. While the clock has been changed from
bottom and also alarm clock moved from top of
the left corner. In android 4.3, the alarm came
from the bottom. The clock is little bit similar
with Android 4.3 aside from the less strong
textual style, bottom setting of letters, more
adjusted numerals and greater begin catch at
the lowest part.
Downloads App
The entire theme of the download applications
for android 4.3 has been changed. We already
know that in android 4.3 version download app
background theme is black color and also menu
list of download apps located back of the apps.
While android 4.4 KitKat version, the
background theme is fully white color and it
display total full screen in your device.
Cloud Printing
Android 4.4 provides printing services also that
can be available in the settings menu. If you
want to modify these options, you can also
enable and disable the cloud print feature at
any time.
Quick Office
Android 4.4 version provides Quick Office
application, this consists some functions such as
latest files, open particular file coming from and
make new file.
Settings Menu
The Wireless & Networks section will be the
same in the android 4.4. The Device section
provides features known as “Home” and “Tap &
Play” with regard to wireless payment with the
tablet.
The features in Android 4.4 Kitkat are:
1. Increased more battery usage
2. Includes 4k resolution
3. It can be Supports the tri-core CPU
4. New structure can be used for UI
transitions
5. Easy navigation
6. New apps can be replaced
7. Developed O.S performance and security
8. Very comfort display provides
9. Total previous Android versions can be up
hierarchical to 4.4 (kitkat).
Source: www.appzuniverse.com/blog/major-difference-between-android-jellybean-4-3-and-kitkat-4-4/

To me I don't see anything different from other operating system