The folks at DPReview have completed their extensive review of the pretty great Canon EF 24-70 f/2.8L II. Did they like it? It seems so, although the usual price complaint comes up again.
“The answer, as usual, isn't necessarily clear-cut, and depends on each individual photographers' needs and preferences. Compared to the previous version, it offers weathersealing and a welcome reduction in weight. The Sigma can't match it optically, especially on full frame, but is so much cheaper that many users may well be willing to overlook this, particularly if they use APS-C cameras. The Tamron looks like a very worthy competitor, offering impressive image quality, image stabilisation and weathersealing all in one package, and we aim to assess it fully in the near future. But quite simply the Canon offers such exceptionally good optics that, if you're after the very best, there's simply no other choice.”