If I'd hit him I would most likely survive in a Golf. Not sure about a Lupo.
....But that's the kind of thinking that mums justify for their huge SUV's. 
Yes, but the "SUV" arguments are flawed. Yes, they may be bigger, and have more "metal" around you, but they generally weigh much more - thus taking much longer to stop, and because they are top heavy (a higher centre of gravity), they have a serious tendency to roll over, and crush the occupants.

The only time "bigger is better" in crashes is in "normal" cars - so a Lupo against an Audi A8 won't stand a chance.