We are urgently waiting for the release of the new software update for symbian ^3 phones including N8, C7, C6 and E7 called Symbian Anna. It will bring new Web browser, new icons and many improvements in software. And also we are expecting that it will solve the bad purple tint about what i wrote earlier. And some users who are now using the leaked China version of symbian Anna said that purple tint is gone on their Phone's after update so maybe we finally get the full potencional from our AMOLED screens. Finally Nokia is getting better.
Here is maybe only prove for now that Symbian Anna really solved the problem
EDIT: 18.8 - Its not solved and its still here, but clock and themes are made without gradient so its invisible.