Z4 Handschalter vs. 911 Porsche Carrera T

I am thinking about adding the Z4 Handschalter to my sports car collection. Currently, I have 911 Porsche Carrera T (7 speed ZF Manual) and F-Type P450 V8 (8 speed ZF automatic) RWD.

Does the Z4 Handschalter drive "uniquely different enough," compared to the Carrera T and the F-Type V8, to justify adding to one's sports car collection? I tend to drive each sports car at least once a week.

Honest and expert opinions, who have driven the Z4 Handschalter in person, are greatly appreciated. Thank you!