Bakewell wrote in post #15319663
If the "Tamron proves worthy" like it's sibling the 24-70 2.8 VC, then there may be a substantial wait before any price drop. the Tamron 24-70 is approaching its one year birthday and most major sellers still offer it at it's introductory price of $1299.
While I agree, that's not exactly the same situation. The Tamron 24-70 2.8 VC has one significant feature that the Canon counterparts lack; stabilization or aperture, depending on the Canon model you're comparing it to (F4 IS or F2.8 non-IS). Neither of those are minor features, so that gives it a distinct advantage vs. the Canon offerings because it fills an obvious void (2.8 stabilized). This distinction may help justify its steady pricing. The Tamron 24-70 also has a significantly greater price difference between against the Canon 24-70 2.8 ($1299 vs $2299 at the moment).
In the case of the 70-200 2.8's, the Canon has a few features that the Tamron doesn't (focus limiter switch, 2 mode IS), while I don't see anything on the Tamron that's lacking on the Canon. This will force it to go more head on against the Canon because there's no clear distinction aside from price (and perhaps its slightly smaller size). At $1499 vs $2099 there's a smaller gap in price which, to me, means that it will have to work harder to prove it is worth the price.
Just to be clear, I'm not at all knocking either of the Tamron offerings, just explaining my opinion on how they compare. I'd love for the Tamron to equal the Canon for $600 less. Even if it doesn't, it may still be a great alternative. I'm also seriously interested in the Tamron 24-70, mainly due to its combination of 2.8 and VC, which Canon obviously chose not to offer.