I also have noticed that my 2012 Mazda is not as quick from a stop as was its 2011 predecessor. The reason for that is that the Skyactive engine has a compression ratio of 12 to 1, and because of things that the designers did to permit the use of regular gas, the low RPM torque is less than in the past. (The gearing might also be a little different.)
Offsetting that, the mid-range performance, from around 3000 RPM, is excellent.
If I need to take off fast, I just give it more pedal, and watch the real time gas mileage drop to 5 or 6 MPG. <g>