A 35L replacment will be similar price (when it settles down)
should be comparable to the 24L mkii. £1,500 is in the region of the 24L TS bracket.
Yeah Canon need to have a rethink not only on prices but a few replacements to keep tabs on sigma if as I read they are refreshing the whole line up to 3 ranges A, C and S line ups. They have fallen behind to Nikon on the bodies but people always back it up with the quality and tolerances of their own lenses. If they start losing out on the lens front as well it hopefully will force them to look at their pricing.
I think this Sigma love thing is got a bit out of proportion. Lets face it, they have 3 decent lenses on EF, a 35, 50 and 85. Most of other Sigma lenses I wouldn't touch with a barge pole, their stuff is decent for the money (if you get a good one) but the quality control on them (Except the 3 recent ones) has been terrible, not just personally speaking but it has been general consensus for years.
If you want the best 24mm it is not a Sigma.
If you want the best 100mm it is not a Sigma.
If you want the best 135mm it is not a Sigma.
If you want the best 24-70 it is not a Sigma.
If you want the best 70-200 it is not a Sigma.
So I wouldn't think Canon has anything to worry about yet, they refresh their lenses often enough (check the age for 24mkii, 50/1.2, 24-70ii, 70-200ii, 16-35ii, 85ii, 100L, 135L), and keep bringing out new lenses that no one else makes in recent years, the 17mm TSE, 8-15mm fisheye. The only exception is the 35L (and the 50/1.4). Between the time the first 35L came out til the Sigma 35 came out, Canon has releases and replaced practically all their L lenses between the range of 14mm to 200 in both zooms and primes.
I could argue that if you want the best 35/50/85 that they are not Sigma lenses either, aperture speaking at least, both the Canon 50/85 gets to 1.2 and the 35L is a very close or better performer (I do admit Sigma has less CA), certainly the Sigma 35 is a very very decent lens and I would happily buy or use one. But we have to remember that the Canon lens is almost 15 years old, before the age of 10D, I don't think the D30 (yes, Canon used to put
D in front of their numbering at one point) even came out yet, it pre-dates all Canon/Nikon DSLRs.
I do agree though, they are trying and getting away with their new increased prices.