Remember that some of the A lenses are the same as their M counterparts. At least according to Cecchi these are the same as the M:
28/2.8 35/2 35/2.8 50/1.7 50/2 100/2.8 100/4 macro
24-50/4 A* 300/4
28/2 is also in this category.
But 24-50 M is different from the A version
Cheers,
Andre
