Can't comment on the Infiniti never having owned one. Had a 2008 328i 6MT for two years and never felt is was a slow car. I may be old school, but a 0-60 time is the low 6 second range is not slow compared to most cars. Sport and premium is a must IMHO.
One thng I liked about the 328 is you could rev it all the way to redline and have decent power. Stay on the power band and the car is by no means slow. I can't rev my 335 like I did the 328, course the low end power is no comparison.
JB4, BMW Perf. Exhaust, DCI, Strut Brace, KW Series 1, Quaife LSD, Black Kidneys.