I think you might be surprised how quick 110HP with relatively skinny tyres and only 420kg goes.
Cars like a stock road going GTR were something like 8-10s/lap slower at Eastern Ck than a FF (1km long front straight too) but ultimately there's no question a car like the F1, GT3, etc are special, but they aren't ordinary, mass produced road cars either.
Just a FWIW, here's the race results for the Sports Sedans at EC in '98.
NATSOFT Race Result (I couldn't find any results from further back)
Remember most of these are 600HP, mid engined, wings and slicks monsters. Their lap times are the same as the FF's or slower.
Heaps of fun, hard to drive and make all the right noises though.