I found this article over at BGR, and to be honest, I never really think about data speeds when looking at a smart phone (this is mostly because I think it is more of a carrier issue than a phone issue). Anyway, they tested a variety of smartphones to see which could download (Pic 1) and upload (Pic 2) data the fastest. The Galaxy Note 3 has the fastest download rates, while the Samsung Galaxy S5 has the fasted upload speeds.
Something to think about before buying your next phone, I guess. Sometimes amazing specs aren't everything.