Been ages since I've posted, but have owned a few of the lenses you quote. Comments are based on using an a900, but only my humble opinion. Take with pinch of salt.
In preference between the Beercan and T 70-200. The Tamron is probably the slightly better at focusing speed, but only slightly (T uses body AF motor, unlike most reviews that test with N/C mount that use a lens based focus motor - which is v slowwwwww.). I would say my Tamron was sharper at f2.8 than the beercan was at f4, but again only slightly (and haven't ever pixel peeped both side by side, so a bit of a guess)
But the Tamron is larger and more expensive. Beercan is a bargain and a fantastic lens for the money, so take your pick.
I have the Sony 85/1.4. Lovely lenses and is not comparable to the Tamron macro (actually had the Sigma 105mm). Large aperture (1.4/1.8) lenses almost demand you shoot wide open, so is hard to compare the two lenses.
I would say, depends on my style of photography.
Sony 24-70 is the lens to save your pennies for. Amazing lens, probably sharper than my Sigma 50mm f1.4 prime at f2.8, but a heavy package. Tamron 28-75/2.8 was a great alternative for much less money, which was fantrastic from about f4 (but fine at 2.8)