When VZW implements the full LTE specification in late 2013, early 2014 that will be correct. But to speed up deployment they only did the LTE data side. Which is why they are further along than any other carrier. In fact it is possible they will be finished with voice before AT&T's LTE is fully deployed. Which I find pretty dang ironic.
I was with AT&T for years. When all my friends talked about the superior connectivity they had with Verizon, I would say "but I can text and talk". Turns out that isn't much of an advantage if you have no service. Recently I switched to Verizon. I don't miss the text-and-talk feature AND I don't miss the No Service display that I often saw at the top of my phone, either.