This 35mm f/2.7 lens is the smallest fastest pancake for Sony E-mount and costs 1199 Euro

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You can get it here on Kickstarter. They write:

ExperimentalOptics is back. The geeks from Berlin that brought you the fastest lens in the world, the 50mm f/0.75, are back to bring you something even bigger…
…well, not actually bigger.
Actually it’s the smallest lens in the world! A super flat, super sturdy, super fast and super high image quality pancake lens.

The only small caveat…you have to pledge 1199 Euro.