Presumably you've read all the threads in the F30 forum. There are several discussing (well, ranting?) about the magazine comparisons. There are several saying how much better they are than the E9x. (There are several on the E9x forum ranting about how much worse they are than the E9x.)
Nevertheless, the F30 328i (turbo 4) appears to be really really really good. But it's quite a different car than the E46: only if you go E46-E9x-F30 would you feel the evolutionary changes. If you get the adaptive sport suspension and sport variable steering, you'll be way good, IMO.