Seasons Greetings to One and All! I have a question about 14mm lens. This is a focal length that I would not use too often ( but when you need it you need it), as a result I'm not sure I want to put $2000 in a Canon lens. I see that Tamron (Bronica) sells their version in Canon mount for $1099 and Sigma is in at $899. Both are 2.8 and I need some feed back as to image quality, sharpness (corners and center-wide open and stopped down), contrast, distortion (with a leveled camera set-up), and built quality-you know all the things one would want to know when they are spending this much money. Also has anyone any experience with the 70-200 2.8 IS and the 300 2.8 IS? Thanks in advance. Cheers Wilber
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