I have the AT4040. Haven't had it as long as I've had my CS1, but in comparison the AT4040 sounds clear, but somewhat thin. I feel like the vocals don't have enough "weight" and lack that punchy, in your face quality with the AT4040. Don't get me wrong, you can process vox and get a good result, and for certain voices, it might be the perfect match, but I kind of wish I would've went with the 4033. I'd love to see how the C214 sounds in comparison as well.
That being said, I get a lot of use out of my AT4040 still. Usually I put up my CS1 and AT4040 and record lead vox with em, whichever works better in the mix gets the prominent lead role. Plus, the AT4040 works great for me with overdubs, adlibs, etc... Maintains the clarity there without stepping on the lead vox and getting muddy.
This is just my experience with the AT4040. As always, YMMV. It's not a bad mic at all, better built and better sounding that your overly hyped/bright cheapo condenser mics. And like I said, I still get a lot of use with it. But if your looking for "ballsy', in your face vox, you may want to look elsewhere. Just my 2 cents.