If you count HSPA+, essentially "3.5G", the fastest I've had is 8259kbps down, 1275kbps up. Speeds have been all over the map for me, going as slow as around 2000kbps down. No LTE in my area yet, so I have no figures to pass your way.
When I was in San Antonio last in November I was getting on average 30mb per sec on avaerage and around 15mb upload fastest was 55mb. Here in El Paso I get from 4- 7 mb down and about 1- 2 up.