Many users reported flickering-minilag problem with 4.3 version on SP.. 4.1.2 version works great without flicekring..
Please vote here who have this problem and who dont.
Here are some links with mentioned problem posted on several blogs-sites.. also there are many more blogs-sites-forums around talking about this problem..
http://www.xperiablog.net/2014/04/15/some-xperia-sp-owners-report-of-flickering-screens-after-update-to-android-4-3/
http://www.ubergizmo.com/2014/04/sony-xperia-sp-users-experiencing-screen-flickering-after-recent-update/
http://thedroidguy.com/2014/04/users-sony-xperia-sp-reporting-display-flickering-issues-android-4-3-update/
http://www.doi-toshin.com/sony-xperia-sp-users-report-flickering-screen-android-4-3-update/
http://www.phonesreview.co.uk/2014/04/16/sony-xperia-sp-android-4-3-update-problems-emerge/
http://semcblog.com/2014/04/16/flickering-display-issues-arise-sony-xperia-sp-android-4-3-update/
Please vote here who have this problem and who dont.
Here are some links with mentioned problem posted on several blogs-sites.. also there are many more blogs-sites-forums around talking about this problem..
http://www.xperiablog.net/2014/04/15/some-xperia-sp-owners-report-of-flickering-screens-after-update-to-android-4-3/
http://www.ubergizmo.com/2014/04/sony-xperia-sp-users-experiencing-screen-flickering-after-recent-update/
http://thedroidguy.com/2014/04/users-sony-xperia-sp-reporting-display-flickering-issues-android-4-3-update/
http://www.doi-toshin.com/sony-xperia-sp-users-report-flickering-screen-android-4-3-update/
http://www.phonesreview.co.uk/2014/04/16/sony-xperia-sp-android-4-3-update-problems-emerge/
http://semcblog.com/2014/04/16/flickering-display-issues-arise-sony-xperia-sp-android-4-3-update/