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Feb 13, 2014 · I recently purchased a 70D and Sigma 17-50 2.8. The focus ring was faulty, extremely sticky, so I sent it back to DWI. I am now considering the Canon 17-40 f4 L series lens. My question is; is the L-quality glass, better build quality, nice focus ring and possibly increased sharpness worth it the 2.2f loss? Which lense would you go for on a .... Half of the center sharpness images resolve sharper on the 17-40, irregardless of focal length and F-number. When it comes to corner sharpness, the Canon 16-35 F4 IS is a clear winner, with the 17-40 performing softer on corners. With regards to corner CA, the 16-35 F4 is again the clear winner..