I see the special edition Leica 50mm Summicron is now for sale. I have the Summilux which as you can see above produces a lovely image. There are two versions of the Summicron, the standard none APO which is very affordable for a Leica lens and the APO version which if you have £6000 will leave you change for a few nice coffees.
This special edition wraps the lens in the old metal classic design with red trim and costs over £8000. A lot to pay for a 50mm lens no matter how good.