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After I updated to ICS, my screen is all washed it. I've lost the vivid colours of the Samsung G2 screen. I'm unable to make any adjustments to screen brightness or mode to bring it back. As anyone else come across this ?
You can change brightness by going to Settings -> Display -> Brightness. Make sure to untick Automatic brightness. You can also change the screen mode to Dynamic (should be the vivid you're after) in Settings -> Brightness.
How did you upgrade? Have you tried a system restore?

I meant to say adjusting the brightness makes no difference. I noticed a few others having similar problems.
No matter what Brightness settings or mode I change in settings, the screen remains washed out.
Can you take some screenshots?

also I found that screen is not responsive as it was!
Sometimes take couple times to understand that I am pressing certain menu or icon on screen, strange but it's true
I have also found the following :
1) Some widgets are unresponsive and take 2 or 3 taps for the app to open.
Since I have updated my Galaxy SII (sim free version) to ICS 4.0.3 I noticed that whenever I charge the battery, device is getting hot ( on the left side back of the phone ) and also battery drains much faster then before (which never happened while it was on Gingerbread 2,3,4) also I found that screen is not responsive as it was!
Sometimes take couple times to understand that I am pressing certain menu or icon on screen, strange but it's true! As well as more RAM is being used now with ICS than with the Gingerbread.
Also in the Setting Menu I noticed that some of the informations are not visible as they used to be, there so dark gray now I need extra effort to see them! I'm regreting the day when I updadated to ICS 4.0.3!