Most (actually all that I have seen) of the reviews, although they are not for the same exact car we're going to get here, comparing the 2.2 Skyactiv-D and the 2.5 Skyactiv-G say the Diesel has some pretty bothersome turbo lag and also says the 2.5 Skyactiv-G is hands down the better drivers car.
I do not see how the diesel engine could possibly have turbo lag, when it has two separate turbos in a sequence, one of which has been specifically designed to be responsive at lower RPM ranges.
Be that as it might, from experience, the diesel engine in my mazda6, which is two generations prior to Sky-D, behaves exactly as a gasoline engine would until 2,200 RPM; it is literally like driving a gasoline car, up to that point.
For my part, I know that I will never again own a gasoline powered vehicle; once one goes diesel - one never goes back (I drove V8's and twin turbo gasoline V6's prior to that). The torque, the high top speed, the acceleration, and the fuel economy makes one addicted.
When I look at the gasoline engines available today, and I compare that to all the diesels I have owned since... there really is no comparison in the same class.
I could compare my diesels with gasoline V8's, that is about as close as a gasoline engine will come when compared to a diesel one. Especially when compared to mazda diesel engines.
I'm going to spend plenty of time in both before deciding.
I think that it will quickly and clearly highlight just how superior in performance the diesel engine is, and I think mazda is very wise to position the Sky-D diesel as an alternative to gasoline V8 engines in the minds of its U.S. customers:
(time point 02:08) http://www.youtube.com/v/cK5SQkEUBdo...ure=plpp_video
Just remember to keep the diesel engine in the torque range -- oh! Wait, the torque curve is flat; 310 footpounds of maximum acceleration all the way to the redline!