My thoughts exactly. Here’s the question I would ask: Do you have at least $1000 to spend on a preamp?
If not then I would suggest selling the u47 and buying a less expensive (but still really good) mic or two, and a couple great preamps, and upgrading any other parts of your signal chain that need it, or getting room acoustics treated, better monitors, etc. That is a wonderful mic but you may not be as happy with the results you get if the rest of your setup is lacking in quality.
Having said that, I wouldn’t mind having the “problem” of owning a u47 but needing a preamp to use it with.