Whilst the Do328 may be a quick turbo prop it is not quicker than a 146. It climbs at 200knts, it will cruise at about M.53 at FL310 and has a VNo of 270knts which will lead to the speed horn sounding continuously, leading most crews to fly at 260knts. The 146 is quicker in all segments accept the last 15 miles when you can leave the Dorniers speed higher until much later, like any other turbo prop. I have flown both, the Dornier has the best flight deck but for speed and pax comfort the 146 has the edge, although the time difference is only 10 mins at best from EDI/GLA into City.