The Voigtlander Nokton 50mm F1.0 is the result of the best that modern technology has to offer: Aspherical optics computed to the nth degree, exotic glass, precision computer-automated machining. I'm amazed that this lens is under $4000, let alone under $2000.
The 50mm F1.0 Noctilux was developed using state of the art glass of 50 years ago, where the engineer used mainframe computers to validate designs- not to guide a design. Much more Human in the trade-offs. The Voigtlander 50mm F1.1 is a more modern implementation of the design concept of the 50/1.0 Noctilux. Focus shift- Yes, but carefully controlled to give a unique rendering of the out-of-focus areas. First shot I took- looked at the OOF circles, tried to figure "How did they do that". Spherical aberration is caused by the focal length of the lens not being equal across the full area of the lens. That's why when you see bright edges that look like donuts on the OOF circles. The change in focal length controls the density of the OOF circles. The 50/1.1 Nokton: the engineer gave a lot of thought on the slope of the change of the focal length as you stop down.
So if Stephen had not sold out all of his 50/1.1 Noktons at $700- maybe he'll decide to keep them another 5 years when they hit Noctilux prices. Remember when everyone dissed the Canon 50/0.95? I picked up a pair at $200 each.