I have a Brauner Phantom AE and also the Manley Cardioid Reference. The Manley sounds much better on every vocalist I've tried to A/B the mics. It was a no contest situation every time. The 2 mics are completely different animals. The Brauner sounds so obviously solid state and the Manley definitely has the tube vibe going on. I've not had a problem with either mic being too sibilant. But then again I'm using a Neve Portico compressor after my preamp. It has this uncanny ability to eliminate sibilance. I have no idea how, but it does it. Hope that helps. Oh, have you tried that Brauner on overheads yet? It's my favorite OH mic right now.
I love what they do on the high frequencies... I'm sure it's just distortion, the high end has this smooth, almost grainy quality to it that really shines on some vocals. I tried the Manley Gold Ref mic for comparison and it's not there... Perhaps the gold is too clean?.
Swappin' out the stock 12ax7's with other (telefunken, mullard) NOS tubes makes a big difference too.
Make everything louder than everything else.