The SME V is available with a removable headshell as a special order. With this option, the SME V has azimuth adjustability. To my knowledge, the V-12 does not have this option. That function exists in the 12" SME 312S arm.
If the OP auditions the SME 20/12A and it is supplied with the 312S arm, he will be able to adjust azimuth at the headshell.
If the OP auditions the SME 20/12A and it is supplied with the 312S arm, he will be able to adjust azimuth at the headshell.