You really gotta read the two Metabones Speed Booster reviews at EosHD (Click here) and Lensrentals (Click here). Both Andrew and Roger are extremely surprised by the terrific image quality they can get through this adapter! As you know this lens increases the speed of a Full frame lens by reducing the image circle projected on the APS-C sensor. At the same time the lens also gets wider. The first two adapters for the Fuji X mount will be sold in February. There will be a Leica R (lenses here on eBay) and an Alpa (lenses here one Bay) adapter.