If the old Tamron A020 28-300mm XR Di VC LD is as good as mentioned on this forum (http://www.dpreview.com/forums.....t/32317921) with the exception of noisy and slower AF system when compared with the Canon 28-300mm L lens that is $2000.00 more, It a no brainer to pick up this lens to replace my 24-105mm f/4 L kit lens for the 5D Mark III as my main all purpose lens if it has improved the IQ and adding new VC and PZD AF system to the new A010.
When comparing Canon 24-105mm vs Canon 28-300mm at The-Digital-Picture.com (http://www.the-digital-picture.....;APIComp=2) both at f/5.6, the 28-300mm L produces more than adequate IQ. If this new lens has the same IQ and with only 1/3 of the weight, moisture resistant and priced at same amount as the Canon kit lens.... I hope Canon is paying close attention...!!
I have had several modern TAMRON "all-purpose" vari-aperture lenses in recent years for use on both my film bodies & digital bodies. Presently, I own the 28-300 XR lens AND the 18-270 XR lens. They are fine quality & serve me well when I just want one lens to do it all. The nice part about the 28-300 is that it works well w/ the 7D body OR the 5D Mk II body OR the EOS 1V body. On the 7D, I get that 1.6x advantage. I also have the CANON 28-300 L IS lens, and while it is obviously optically very fine, it is also a considerable weight, especially IF one is on the move throughout the day.
Regarding the EF 24-105/4 L IS, I think CANON should look at the newly released SIGMA of the same specs. In recent tests, the new SIGMA lens quite easily OUTCLASSED the CANON lens. I'm NOT TOO SURE the CANON brass are too happy about that advertising.
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