It's a great lens but they are selling new at Samys for $650 right now. It's hard to get a used one for under $600 though. You might want to check if it can be used with a full frame sensor. I can't remember if it starts to vignette at the widest point or not. I'm sure someone will provide that answer. But it's being repackaged as a cine lens for 3 or 4 grand right now. The past two behind the scenes videos of Reds I've looked at lately both had this lens on it.

@pvjames, oh cool. I wasn't sure. I was just test driving one today at Samys but the only way it will work on my GH2 is with the damn $300 Novaflex adapter. None of the cheap ones work with Nikon lens' on my camera, so that turns it into a $1000 piece of glass real fast! Awesome lens though!