I've only seen two registered F30s on the road here in Sydney since I ordered mine - likely I'd seen more before that and just hadn't noticed them until now. I spotted one Sapphire Black Luxury Line with 18s in Ashfield and then today I spotted a Havanna Modern Line around Lane Cove.
Just on the size thing, I definitely feel that the F30 is a lot roomier. The first time I looked at buying a BMW it was an E46 back in the mid 2000s and on my first and only testdrive I found my head constantly bumping off of the roof (thanks to standing 6'2"); I discounted the 3 series ever since. I ended up with a company car for several years but when I went back to buy my own, I originally went in to the dealer to buy a stock-as-a-rock 520d and once I sat in the 3 series and found it much roomier than its predecessor, I ended up taking a 320d with a few options and a bit of $$ back in my pocket.
2016 F15 X5 XDrive30d M Sport
2012 F30 320d Luxury