Macro action now at A href='http://www.digitalcamerareview.com/default.asp?newsID=5457&review=sigma+105mm+macro+lens+f2.8+fantastic+image+quality'>Digital Camera Review where they tested the Nikon flavor of the Sigma 105mm f2.8 macro lens.
The new Zeiss Otus 55mm f1.4 SLR lens has another review out, waiting for your eyes at Dxomark. Is it raining superlatives?
UPDATE: Dxomark has now published their take on the Canon version of this lens. The review in the first paragraph was for the Nikon version. With a $4K lens, you'd better test every variation and sneeze :)
Superlatives or not, it is also raining dollars - the lens is available for pre-order for $4000 at Adorama and B&H Photo in Canon or Nikon SLR mounts.