I've got the Tamron 24-70 SP for more than 1.5 years now and took thousands of pictures with it. Just a few week ago I bought a used EF 24-70 L II. The IS of the Tamron had been of little use for me. I got the impression that I lost a little bit of sharpness by the IS in situations of > 1/30 sec. - situations when IS should help you. But the mediocre IQ at the wide and tele end is the annoying factor and the reason why I bougth the EF lens for its slightly better IQ.
Maybe I'm too critical or spoiled by the TS-E lenses. The IQ of the EF 24-105 was too bad to even consider buying it, although it has IS. I shoot landscapes and quite often I stitch panoramas, so I need high resolution and sharpness from corner to corner because a lot of corners are right in the middle of the image later on. You also lose sharpness and resolution by the stitching process (at least with Autopano Giga). Normally I take my time and use the TS-E lenses but on the rare occasions when I leave the house with just one lens (24-70 zoom), I want the best IQ available. To sum it up: if Canons puts IS into the EF 24-70 f2.8 L, the IQ should stay the same or improve. Everything else would be of little use because there is already the Tamron lens, which became pretty cheap over the last months.
Maybe I'm too critical or spoiled by the TS-E lenses. The IQ of the EF 24-105 was too bad to even consider buying it, although it has IS. I shoot landscapes and quite often I stitch panoramas, so I need high resolution and sharpness from corner to corner because a lot of corners are right in the middle of the image later on. You also lose sharpness and resolution by the stitching process (at least with Autopano Giga). Normally I take my time and use the TS-E lenses but on the rare occasions when I leave the house with just one lens (24-70 zoom), I want the best IQ available. To sum it up: if Canons puts IS into the EF 24-70 f2.8 L, the IQ should stay the same or improve. Everything else would be of little use because there is already the Tamron lens, which became pretty cheap over the last months.
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