Koisrus
If you are just starting out in the hobby, I would suggest learning more before making a purchase of that magnitude. I personally would not pay that much for that kohaku. And if I had to ask others what they thought and what they would pay for it, then I would not buy. When you are spending that kind of money on a fish, you should be able to tell if it is worth the asking price, and not depend on someone else or a dealer to tell you. Just my thoughts. Hope to see you post more in the future, perhaps you can go and read some of the old threads, and get some valuable information on learning, what quality is and confirmation and then patterns.
Enjoy your journey