A comparison of the M3 DCT Vert vs DCT Coupe has been posted on YouTube...
Here's what the M3 DCT Vert vs C63 and M3 DCT Vert vs DCT Coupe races look like when the guy says 250km/h in each...
Based upon the above you'd have to say the C63 still beats a DCT Coupe from rolling, although I do think the Vert got the jump on the Coupe....still the difference between the C63 and DCT Coupe will be pretty close...