Is very differs the AF speed with U/S/HSM and with out this in lenses with distances focal under 70 to 100mm??
Never I has used a lens with motor, but a friend told me that not have differs in speed under 100mm, but yes in noise. And he refers me that real differs is in lenses with distances focal above 100mm.
In my opinion, Sony is reissuing old lenses Minolta, but no all, and with improvements in quality or acting.
-Minolta AF 100-300 f/4.5-5.6 APO = Sony AF 70-300mm f/4.5-5.6 APO G SSM
-Minolta AF 17-35mm f/3.5 G = ¿Sony AF 16-35mm f/2.8 "G"? ¿Carl Zeiss?
-Minolta AF 28-70mm f/2.8 G = ¿Sony AF 24-70mm f/2.8 "G"? ¿Carl Zeiss?
-Minolta AF 100-400mm f/4.5-6.3 APO = ¿Sony AF 80-400mm f/4, f/5.6 or f/6.3 "APO G SSM"? ¿Carl Zeiss?
-Minolta AF 24mm f/2.8 = ¿Sony AF 24mm f/1.4 or f/1.8?
-Minolta AF 35mm f/2 = ¿Sony AF 35mm f/1.8?
About DT lenses, I think that the models Tamron (like 18-250, 55-200, etc...) go on in Sony together to new model like the DT 16-80mm and 16-105mm (this like to the Minolta 24-105mm but for APS-C).
Now, this lens sure will be launch together DSLR FF and this I think that yes is the problem.