I saw a forum about people against Sprint's speeds. They used speedtest.net to show their speeds.
I guess speeds are based on geography because I just tested mine on Verizon and got a surprising .37mbps down and .05mbps up. I know I've gotten faster speeds in other parts of my town, and portions of my house are strangely not covered by 3g either.
I also believe I found your PC World article which mentions 3G and 4G speeds. I'm shocked that around the country T-Mobile and AT&T are rated as top 3G and 4G carriers with 3.84down/1.44up and 2.62down/.85up. The article mentions that one large city near my region, Denver, lacks AT&T 4G coverage, and I know that my region lacks T-Mobile coverage completely. I'd love to know what my expected Verizon or Sprint speeds should be. The article also listed Sprint as having fallen from ~1.5mbps down to now ~.6mbps down in one year.
Just for fun I will post a link to the article I found as well:
3G and 4G Wireless Speed Showdown: Which Networks Are Fastest? | PCWorld