Size man depends on your needs, I used to have a passat and jumping into the F30 made me worry but I think the F30 is good space wise, wife one or two kids it will be fine. Not sure about the current state in Bavaria builds but I would have missed xenons , sport auto , comfort access, rear auto window shade, window glazing , bt stereo streaming, navigation once it works, of course the major thing would be performance , the 328i is equivalent to 535i performance wise, I know this from the street as well racing with a 535i
I would check the latest options in Bavaria and would sit in both cars and look at the boot, I was impressed with the size difference inside taking into consideration the 5 series is much bigger outside.