European readers can preorder the new 24mm f/1.4 GM lens at Calumet Germany and WexUK. USA preorders will open soon at Bhphoto, Amazon, FocusCamera and Adorama.
New full size image samples can be seen at Lenstip.com.
And this is how small the new Sony lens is when compared with the Sigma and Canon equivalent lenses:
via Camerasize (note Camerasize show the Sigma with hood only).