Stay away from Tamron(24-70 f/2.8)

As I said you must have had a good copy. I've owned other Tamron lenses too. 17-50 VR, returned it as it was no good optically, it always gets bashed on internet forums that it's no good, unlike the 17-50 no VR which gets reasonable feedback. I also owned the 70-200 2.8 but focus speed was way too slow. Unless you are on a extra tight budget or you use your camera once an year, i would't bother buying Tamron.