Thanks for the great comparison!
I prefer the F30s exterior over the E90.
But I can't get over the fact how cheap the F30s interior is.
They masked it well (most things you touch in everyday driving is solid and has a good feel), but the materials and workmanship in general has slipped much in comparison to the E9x. There is about 30% less interior trim used (at the same price) and about 40 percent less leather/fabric used on the door panels. All substituted by plastic. It is only that obvious in this direct comparison. The only thing I really prefer is the new M-sport steering wheel.
The F30 is now much closer to the F20 1-series in terms of quality, whereas the E90 was much closer to the E60.
Shame really.