OK, Here are my definative results. I have had an MXL990 for a couple of years now. Use it for vocals and really like it. But it has always bothered me singing through a cheap $50 Chinese condenser mic. I figured I better save up and get me a really good mic.
So, for a test, I go to my local music store that has a huge rental department and rent a AT4060 that they sell for about $1500. Don't know much about that mic, but for $1500, I figure it should sound better than my $50 MXL990.
So, I do a shootout in my humble basement studio. So here's the thing. I don't have great acoustic treament, or preamps etc. But, I put the 2 mics side by side on a stand, into the same preamp. Everything is identical except the mic's.
So what do I find. The $1500 AT4060 is a little nicer. 20x better, no. I mean the difference is audible, but so subtle I would never notice it in a mix.
So is the MXL990 that good ? Did I get a special one? I don't know, but I've done the test and made myself happy.