Lately ... comparing shots
I have been debating for the better part of the year about changing from my TAMRON SP AF 28-75mm f/2.8 XR Di LD Aspherical (IF) to the SONY CZ 24-70mm f/2.8
I know it sounds like a "no-brainer", but to be perfectly honest, the differences in performance are truly so close you really have to be desperate to find them, especially in light of the sheer weight of the two lenses and their overall cost for performance.
While I do not have side-by-side comparison shots, what I do have are f/2.8 center and corners of the TAMRON. Even in crappy, indoor lighting, the TAMRON delivers what I feel is a full acceptable image, edge-to-edge.
If anyone has done a comparison series between these two lenses, I would be happy to hear about what you have found. I am at the point of locating the Zeiss lens and doing the side-by-side center and corner examination, just to put my mind at ease and settle this once and for all.
Just for another consideration, I have looked at the SIGMA AF 24-70mm f/2.8 DG EX IF HSM, also, finding it coming up a little shy in the 24mm corners. They are significantly softer than the TAMRON, at 28mm f/2.8, otherwise the SIGMA is truly a contender, too.
Don't get me wrong ... I am not dissatisfied with the TAMRON's capability. Far from it. It has been a brilliant lens for the past two years, but if I am moving up to "pro" level glass, I want to make sure I am buying into a better result ... not just more of the same, in a heavier shell.
Thanks for your contribution, if you make one. :D