In an E92 328i M-Sport Loaner today... my car is a 2012 328i Sport line.
E92 Pros:
Love the engine sound
Seems like there is a bit less wind noise at highway speeds
M-Sport wheel is nice (but this is avail on F30)
F30 Pros:
E92 felt Slow, even compared to the F30 in comfort mode... sometimes I questioned what was wrong coming onto the onramp
8AT in the F30 is amazing compared to the transmission in the E92 (6 speed auto? not sure)
This is subjective, but the F30 interior to me seems way more upscale, driver-oriented, and modern. The general look/feel of the knobs is a bit too old school for me now in the E92. Navi is the same for 2012 model years.
The new key looks nicer
Toss-up:
Steering feel is definitely much better in the E92, more weighted than even the 'sport' mode on the F30. However, in parking lots I've grown to the convenience of the Comfort mode. Call me lazy.
Overall road handling and feel was much more similar than I expected.
Equal amount of slight rattles, build quality felt very similar