I figgered out how to have 4.4.2 update without bugs (sound, etc) .
A little history:
I live in Greece (I dont know if this might help, you will get why i mention this below)
Flashing the phone with pc companion rendered the phone unusable (crackling sound, notification sounds in ear piece etc ), doing factory reset an flashing again did not fix the bugs.
What i did
Did a factory reset wiped data.
I used used Flashtool and downgraded my phone to JB fw 114 downloaded from here http://www.xperiadownload.cz/index.php/xperiadownload/category/44-z1-compact this fw as i can tell is not for europe. its most likely for asia. Eveything was back to normal. (This fw JB has english and all languages).
Customized my phone to my liking (installed apps and upgraded any apps that needed updates.)
After upgrading this fw to 681 4.4.2 using Sony Bridge for mac and not doing a wipe-factory reset. Everything worked as intended. No cracking of sound and notifications videos and all sounds, work well.
I hope this helps Sony or anyone willing to try.
What did not work
used Flashtool and downgraded my phone to JB fw 114 upgrade to 4.4.2 with windows pc companion again problems.
used Flashtool and downgraded my phone to JB fw 114 upgraded with mac using factory reset option.
Ps. This explains some people saying they did the upgrade through OTA and dont have any problems.
Would like feedback from anyone willing to try this.
