On a test drive I didn't find the S5 to feel slow versus, say, the CTSV or XJR, but I didn't drive an S6 for comparison. The XJR definitely needs more winding than the V did even though the tangible results are virtually identical, so I do get what you're saying. I definitely agree about the transmission though - that was a let down for me. I am, however, used to being let down when it comes to transmissions that shift themselves. I feel like I will need to skip '10-'15 cars entirely.