Here is an excellent review of the Tamron 28-75mm f/2.8 Di III VXD G2 vs Tamron 28-75mm f/2.8 Di III RXD Comparison.
The 28-75mm F2.8 Di III VXD G2 has been redesigned to make use of a VXD linear focus motor, rather than the RXD stepper motor used in the original lens
The Tamron 28-75mm f/2.8 Di III VXD G2 has some slight advantages over the Tamron 28-75mm f/2.8 Di III RXD, which you can see below.
Tamron 28-75mm f/2.8 Di III VXD G2:
B&H Photo / Amazon
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