yeah, its pretty bad, stopped down especially. At 0.95, it has its own very special character (think Holga) with the added benefit that it is able to take pics in almost dark. Most everyone who buys the lens will never take a shot at anything but 0.95, as the other apertures are all pretty miserable.
But i would love one for 0.95.
The nocti, although is an amazing lens (have had the pleasure of using one) I REALLY REALLY REALLY wish that i had the sense to buy one a few short years ago on the used market for the 3k or so they were going for.
15k for the last 100 nocti's is insane.