Are you satisfied with your 24-105L?
Yep, I cherry picked it from three and got one which was sharp at
105mm wide open - for the record, they were all great at 24..
have decided to get the 16-35 II. I do not belive the 28-135 IS is
good enough for MK III
the 28-135IS is good enough for the 5D in most cases if it's a good
enough copy and the 5D resolves higher than the 1D3 (13 of the
sharpest megapixels out there versus 10 unknown ones).. I changed
to the 24-105L because the 28-135 does vig worse at the long end
(FF remember), it's a lot slower (gets to F5.6 pretty fast, though
not as fast as the 17-85) and the 24-105's IS system is way better
(though the 28-135s is great) ..
With these cameras having such amazing high ISO performance and
Canon's F4L series being so damn good / well priced / just as well
made / light , the only reason I can see why anyone would want to
lug big heavy clumsy F2.8 zooms about is because they're shooting
in extreme conditions where even a 5D or 1D3 is pushed to the wire
for ISO .. also the 24-105 is better at the edges at 24mm F4 than
the 24-105 is and there is FAR less sample variance..
As for the Sigmas, the 15-30 may end up in the trash, I've seen too
many copies which are OK on APS_C but are blurry edged so badly on
1.3 or FF that even F8 won't reduce it
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Please ignore the Typos, I'm the world's worst Typist