i didn't see this thread earlier. I am the driver of the M3 and the IS-F belongs to my friend. The first video with this link
is the one which actually went well. The other two are the ones which I didn't see the green in time and I launched late. I didn't know he was going to post them. M3 may get an edge when done properly as you can see in the link above. M-DCT would be really good there with the launches and shifts. No matter how fast I shift, it's not going to be as fast as the automatic. The IS-F has a lot of torque compared to the M3 too. I slowed down at the end before the IS-F did as there was something in my way.
In a straight line, I would say these cars are very close. On a track, I am sure you guys know what would happen.