Engine feels very much the same exept the part where you get the extra torque and hp, you really feel the difference there (after driving the old 4.4 for so long, I can really tell). But overall, the engine characteristics are very much the same. Which of course is good for the award winning engine.
The interior was overall the same too, but there are software changes, different color schemes and things like that...
I've noticed the extra torque immediately. I drove a 645Ci Convertible before placing the order for the 650i. The difference is not much, but definetely a welcome upgrade.
Bayerische Motoren Werke AG, abbreviated as BMW is a German multinational
manufacturer of luxury vehicles and motorcycles headquartered in Munich, Bavaria, Germany.
The company was founded in 1916 as a manufacturer of aircraft engines, which it produced
from 1917 to 1918 and again from 1933 to 1945. Official website: BMW
(Global), BMW (USA)