Today is the first time I've seen 4G indicated on my phone while downtown, in the vicinity of 6th & Grand.
However, at the moment, I can't seem to get a data connection with it. Various things I've launched seem to time out as if no data is flowing, despite activity on the little up/down arrows beneath the 4G. Also, the little icon with the two semicircular arrows pointing at each other is staying on, which is what it does when it is having trouble syncing mail stuff in the background.