Ben, one of the ZM test cars will be doing this very shortly. He already has on of my ported TB'* on the car, and stated he would be willing to go back to stock for some numbers.
Another L27 test car will be doing this shortly. MAF gm/sec data at 3 or 4 different rpm levels with the OEM TB, then swap and repeat.
Unfortunately, The other test cars haven't tested, but all did report a snappier throttle response. It'* interesting that the NA cars seem to have responded more, and feel they gain a bit on the top end at WOT. My own car wasn't tested for this, as I did a ported/polished SC and LIM at the same time as the 2nd 'test' TB. I still have that TB around here somewhere as well.
My Gen3 setup also netted no quantitative results, as I did other work at the same time.