I would love to see an $800 50mm 1.4L I would expect it would be sharper, higher contrast and no flare or ghosting at 1.4. I love the current 1.4, but wide open it's hit or miss when it comes to quality. I do love the 50 1.2L, but it is very expensive. I just end up renting it. This new one I would actually buy. If it had IS also, consider it sold.
Tom