Let you Bravia be switched on for about 20 mins. or more before you start calibrating. Play a movie, do not switch on with a blank screen.
Below are professional calibration settings for SONY Bravia EX520. These settings are for a nice picture experience with great color which are true yet pops out. These settings work really well with SD and HD content. Of course, extremely low quality source won't be attractive with these settings. Enjoy guys!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic