I just bought a preASPH summilux last month with a M6 and an tabbed 50mm summicron for $2300. I think the cost of summilux was about $700-$800 for me. My is 70's example and mechanically not so good. Focus is stiff arond infinity. I am learning to using this lens and so far satisfied with its performance. I don't have a hood yet but didn't see flare like X-ray showed yet. Most of time the flare was very local, like around small area of black hair when shooting people aganst light. I think the problem of this lens is that it is relative rare, and hard to find good examples, so price is high. Hopefully the negative comments from X-ray and others can bring down the price and more people can try it.
I don't know how to attach images, but I will load some examples in my gallery.