I replaced an E60 (2008 535Xi) with an F30 (2013 335i xDrive) and am very satisfied.
I wanted a smaller, more agile car, but without the ride harshness that my former E90 (2006 330Xi) had. And I was very interested in the optional suspensions BMW is now offering in AWD sedans.
There are some things I miss about the E60, such as the higher seating, easier ingress and egress, and more spacious interior, but I was aware of those differences after test driving the F30 and formerly owning an E90, so they were not unexpected.
My F30 is much more fun to drive, and I think it looks better than either the E60 or E90.
2013 335i Sportline, xDrive, MG, DHP, Sport AT, Perf tires, Increased Top Speed, PP, CWP, HK
2011 X3 35i, TiSilver, Sport Activity Pkg, DHP, Sport AT, VSS, 19", PP, Tech Pkg, CWP, Prem HiFi, SatRadio