I'm still on my Galaxy S3 still waiting for Best Buy to get the Note 2 in stock and just wanted to point out that a few days ago, I was in LAX and the 4G icon came on! I was excited but was in a hurry and couldn't stand and test it. I kept walking deep into the airport as I was trying to open speed test but then I lost 4G and switched to 3G and speed test never went through. Never saw 4G when I was leaving the airport...
Unfortunately I live in Cypress, CA and so I'll have to wait for Orange County to get 4G before I get to really enjoy it!