Full Frame (FF) or APS-C with Focal Reducer (SB) (LT)?

Challenge #28 in the Technology Enabling Art series. Hosted by ProfHankD.
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Let's compare images shot using either a Full-Frame (FF) sensor or an APS-C sensor behind a "Speed Booster" (SB) or "Lens Turbo" (LT) focal reducer which approximates the FF view. Make sure you include (FF), (SB), or (LT) in the title to indicate which you used to capture the image. Have good APS-C sensors with SB and LT made FF sensors difficult to justify?
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Metabones Speed Booster + Fuji Pro-X1
by motohk
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Contarex 85mm 1.4 @ F1.4 + Metabones Speed Booster + Fuji Pro-X1
Camera:
Lens:
Submitted: Thursday, 27th June, 2013 07:42 (GMT)
Taken: Friday, 8th March, 2013
Focal length: 50 mm
Shutter speed: 1/180 sec
Aperture:
ISO: 1600
Notes:
Views: 400
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