A quick Google search gives you the answer you are looking for. PhD in Finance is a lot more involved than CFA, but (I think) not involved enough to be a quantitative analyst. I am not sure what you mean by quantitative finance, but if you want to be a quantitative analyst in Wall Street, I think you would need a more mathematically rigorous PhD such as engineering, computer science, statistics (not social statistics), or mathematics. Unlike finance or economics, it takes time, years!, to understand these subjects.
But is it worth spending 4 - 7 years doing a PhD so that you can get paid $150,000 in Wall Street after you complete your PhD? Is it not better to just complete the CFA and get a well-paid job in a fund house or something?