Just wondering where you've sourced your times from?
Upshifts with the VAG DSG gearbox are often quoted at 8ms upshifts. Fair few tech docs supporting this. As impressed as I am with the X3's box, it's still IMO not comparable with a dual clutch system.
135/M Sport/Jet Black/Business Nav/Logic 7/Sunroof
If you write 'Wash Me' on my car, I'll carve 'Resuscitate Me' into your chest