In my neighberhood I don't see too much improvement on sprint unfortunately. I am though in the suburbs. Outside the suburbs sprint is ok, but I have not gotten the same kind of speed I have gotten before. The only place I have gotten decent speed on sprint 3g recently is las vegas.
So far I am liking Verizon and my unlimited 4G data...I mean who can say no to this:
But in my neighborhood though its obviously less, like 12mb - 16mb/sec here.