I don't think the other stuff is worth it.
The seats have more adjustments, I think slightly bigger side bolsters. The brakes go from single piston floating calipers to fixed 4-piston calipers in front and fixed 2-piston calipers in the rear. It has metal paddle shifters.
It adds the wider 19" rims, which are more expensive. I like the look of the 17" rims better, but the 225/55-17 tire is an odd size with few aftermarket tires available. It is the standard 528i size, which is probably why 3 of the 4 winter tire options at TireRack are RFT. The Michelin Pilot Sport AS3 is listed in this size at Michelin but not a Tire Rack.
The styling differences are a personal taste. and not that dramatic. The grill dominates the front either way and both have big dual exhaust pipes.
The suspension calibration is supposed to be different. However, I doubt if anyone could separate it from the difference in tires; the 17" has 1" (25%) taller sidewall.
A bigger difference may be the ability of the wheel to survive potholes, especially with the runflat tires. The 19" is probably much more vulnerable judging from the BMW 5-series forums.