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Recently i bought a speedbooster for my crop camera and an L glass canon lens.
(50mm f1.2), it sucks BIG time, vignetting, soft, CA and the autofocus misses a lot.
The next best thing would be a 35mm f1.4 (which would be a 50mm f2.1) native lens, but it doesn't have the same thin DoF capabilities.
Is there any other way to get that Full Frame 50mm f1.2 look? (other than buying a full frame camera), i like my setup with the other 2 native lenses i got.