Sure,
I bought Nick Doshi ALAAP preamp, which sells for $10000.
(Mk. II is $12000)
So it makes it twice as expensive, than Cortese, but it's defenitely not twice as good. In essense, it just serves music in a different way, and it is strictly a matter of personal preference.
There are aspects of Supratek performance, that are better, than Doshi ( I think it is somewhat more dynamic), but like everything in audio, every advantage has a flip side.
I was waiting for it (Doshi) to show up for sale for quite a while, and it happened almost at the same time, as I took delivery of Cortese, so I decided to try something different.
So again, I cannot say conclusively which one is the better preamp, I think Doshi serves my current system and my current taste better, than Supratek.