But I'm not talking about roundabouts or anything like that - have a scroll back and actually read. I've been talking about low speed precision, something that the DCT box is bad at.
For the hard of reading/thinking: From a complete stop, try to move a DCT car forward six inches (as if there was a parked car in front of you) as smoothly as you could with a ZF8.
Hint: It isn't as smooth.
You can't roll slightly off the brake and have the TC creep nudge you forward. You must come off the brake and ever-so-gently apply the throttle, at which point the clutch will engage and you'll move forward. Sometimes that's slow-ish, sometimes that's surprisingly violent (in the context of not hitting a parked car in front of you). Either way, it isn't as smooth as a regular auto or a manual car.
If I take my foot off the brake and don't press the accelerator it gently propels me forward at something like 0.5mph, unless I'm on a slight hill. My car park is slightly elevated for the first few feet and it stops there. I've driven both DCT and ZFs (admittedly only one DCT, and a few ZFs) and I never thought there was any difference in how it reacts in slow speed/from a stop. The main difference is the violence of up-changing when pressing on and the difference in gearing due to extra gear in the ZF8. In contrast, my DSG, as soon as I take my foot off the brake it will move forwards with (what I consider to be) a high acceleration, so have to be really careful to press the brake immediately if I'm doing very very tiny manoeuvre. That isn't a kangarooing motion as a result of the coupling of the engine with the gearbox, but more like the engine revving quite highly when my foot comes off the brake.
I can move my Z4 mm's at a time, never mind inches, whereas with the DSG I can perhaps do 2 inches at a time (without making everyone throw up!).
I test drove both ZFs and DCT Z4s before ending up in a DCT, and in honesty I didn't mind either as they both performed very well, with the DCT having the upper hand due to the more 'violent' shifting when pressing on. I only got a DCT as this particular car was in the specification and colour combination I wanted.
This is my personal experience with the multitude of cars I have driven from a variety of car manufacturers and a variety of automatic gearboxes.