While there is a lot of talk about straight line performance etc etc there is no word about cars handling in equal performance (also a setup difference). I was driving a week in Nurburgring online in different cars (not all, unfortunately), so i can tell a little story.
First of all, Red Bull. This car is already very fast on default setup. What you need to bang top times is increase wings, springs, camber and thats it. Maybe a little tweaks to balance, brake pressure/balance to suit individual driving style.
Sauber, also a very fast car by default. Practically same setup as Red Bull, just maybe +1 click on front toe.
Lotus (Caterham). Appeared to be a very strange car. Very slow in qualifying, some 2 seconds off the pace. Both front and rear toe in must be 0.05/0.20 otherwise it is very understeering. In the race it was a different story. Very solid, very stable, surprisingly fast, kind on tyres and fuel. It looks like DRS is just very ineffective in this car, maybe the reason why it is so slow in Q. I won a race in this car which surprised myself a lot.
HRT. Everyone's favorite car. Front toe must be 0.05 while rear 0.50. Looks pretty weird but does the job.
Lotus-Renault (black car). Front toe must be 0.10 while rear 0.20 otherwise it's just impossible to drive because front end turns in too early and too much.
Virgin. I was a bit distracted how in-car wheel turns, but overall handles pretty same as Red Bull, maybe rear toe -1 click.
All cars with Renault engine: they lack torque when revs are in white zone. It's best to shift in red zone or even green and change gear settings appropriately.
Ferrari engine: best torque between red and white zone.
Cosworth engine: good smooth torque almost in all zones.
Merceds: didn't tested.
If someone can add thoughts i appreciate.