ethomaz on 16 December 2011
Comparing the shipped data with GT4.
GT5 (1 month): 6.37m
GT5 (10 month): 7.3m
GT4 (6 month): 6.79m
GT4 (15 month): 7.63m
I don't have the data to 10 month of GT4 but seems like GT5 is over GT4 in shipped sales.