add to that the stats: 1/1000 fastest shutter available from any lens, 6x6 coverage (comes in handy with T/S or on the X-act), 180/f2.8...any questions? nobody even tries to make lenses like that.....
and most of all: there are tons of used lenses out there for much better prices...snach them up now....
You can also add the prices:
Super Angulon 50 2.8 AFD HFT PQs - $5,142
Xenotar 80 2.8 AFD PQs - $3,098 (this price for the kit lens? )
Tele-Xenar 180 2.8 AFD PQ - $5,864
That's what you pay only for three lenses.
Down here in Earth you can buy a complete medium-format-digital-kit for that or very near price, and you won't see loss of quality. But all depends on what you want to do with your money.