Xperia C is the first Sony device powered by a Mediatek processor. Xperia C is powered by a Quad core mediatek MTK6589 processor and Power SGX544 GPU.
Is it worth buying this product?
If the price of this device was around 15K , it would be the ideal phone to buy. But Xperia C is priced at 18K. If you can give Rs 2000 more you can buy a 1080p Full HD Screen device with a massive 4000mAh battery and a better processor ie Xolo Q3000.
Even at Rs 15000 you can get better performing devices,with an updated Mtk6589 processor clocked at 1.5 Ghz named MTK 6589 Turbo. Xperia C ships with an older 1.2 Ghz mtk6589.
From many reviews online it is concluded that Xperia C's camera performance is average. The 8MP seen in other Sony devices is different from this one. Xperia C can shoot and play 1080p videos natively though, thanks to this processor.
Will this get Kitkat update?
Probably not since this is a Mediatek device. You cant even unlock the bootloader of this device like you do on other Sony devices. Roms like CyanogenMod,AOKP,OMNI,Paranoid etc are almost impossible to develop since mediatek devices source code has many issues.
Update : Sony has released a 4.2.2 Update for this phone. - Improves the camera quality a little bit.