I've only had my 330d M Sport for 8 hours but to answer your original question it is every bit as good build quality as my E60 530d M Sport, and handling and performance is in a different league! It's sooo fast - the figures are similar to what the M3 was achieving just a few years ago.
Can't say how it compares against the F10, but I really don't like the new 5 series, it looks like a truck (sorry). My advice - go F30.
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F30 330d M Sport, Tanzanite blue, 19" alloys, DAB radio, Harman Kardon sound, visibility package, sun protection glass, M Sport brakes.
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