Dave, if you're considering the 1.4 it might also be worth looking at the Sigma 50mm F1.4, the reviews of that lens have been excellent. To quite one review
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This new lens essentially redefines its class, and for once the results really live up to the marketing hype; compared to previous designs, we see significantly improved sharpness at large apertures (presumably due to a reduction in aberrations through the use of an aspherical element), and substantially lower vignetting due to that that oversized lens barrel. Chromatic aberration (both axial and lateral) has been impressively minimized, and distortion is low - in optical terms there's simply little to fault.
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