I only really noticed it after I raced my cousins 2012 Lexus IS250 lol. He got me from a dead stop because of that lag but eventually I caught up. Still, it sucks that my car is technically half a second slower than it normally would be due to that delay.
*shrug* 0-60 is a meaningless single metric in most circumstances. Grip is compromised on a FWD car, and the Hankooks on DCT cars are.... "OK", at best. Unless you're on warm, grippy, near-perfect pavement, a full-throttle start on these cars in 1st gear will ALWAYS result in lighting 'em up, despite on-throttle torque management. Your car isn't a half second slower because of bad programming, it's a half second slower due to inadequate driver skill and knowledge of the vehicle. Just please don't full-throttle through a cloverleaf freeway on-ramp, or you'll wash out the inside tire and merrily understeer into the guardrail.
The IS is RWD, so he's always putting that stonkin' NA 205HP/184ft-lb down on the drive wheels.
You'll always eventually catch up, because you have a nice flat torque turbo curve paired to a shorter-ratio transmission, and are a few hundred pounds lighter.