I just put this up at my site:
Sept 22 2007
Well it's been some 2 years and 3 months since I posted this comparison (from June 2005). The update here is as follows:
*I had used 3 copies of the 2470L up through June of 2005, and the best copy was the one in this June 2005 comparison. The 2470EX DG Macro in the test was my only copy I had but it was calibrated at Sigma NY for front-focusing (obviously came back fine and good).
*Since the comparison, and after having used these 2470 lenses quite a bit, I came to the conviction that the 2470EX was at least as good, if not better, than the L optically. You can see my findings here:
*I eventually sold the 2470EX (reluctantly) to a good man in Missouri (Lincoln Westfall).
*Lincoln recently sent this copy of the 2470EX to Klaus at Photozone for a test (on a APS-C body).
*Here are the results:
*You can see it's a solid performer, to say the least. Consistent with my own findings.
*And here you can compare PZ's findings with the 2470L they have used (count all FOUR of them):
*I think we can fairly conclude at this point that the EX is a complete "steal" of a lens (i.e., a properly functioning one, of course). It lacks the L's refined build and weathersealing and ring USM with FTM and "sexyness" (which is why so many buy the L ), but at $375, the EX remains a very solid bang for buck standard zoom.
*Note that both my tests and PZ's only consider APS-C bodies, so how these lenses compare at the edges on APS-H or FF is undetermined.
So consider this thread "updated".