I tested a lot GT2 and F Abarth, only few laps at Monza and Imola with Lotus 49... but I will test deeper that car because can be a nice one to compare.
But my first impression was not good... default setup at Monza is crap for me. The car understeers heavily, and to break is sooo easy, despite having bad brakes and stone tyres you can breake It easily, and at high speeds you will never suffer oversteer. In Imola works different, in Imola you can "play" with It, slide and that stuff, but in a strange way, the car lose and recovers grip really fast, too aggressive, as soon as you begin to slide you countersteer and rear wheels gain grip suddenly, It's hard to explain... as I said, I will test this car as comparison because is a good starting point.
Oh... BMW is a GT2 and is totally different from all rF2 GT2s... pure grip and no way to oversteer with default setups, and if you touch setup, you can get oversteer but always in that strange way you lose speed fast when slide and then the car recovers grip suddely again like nothing happened.
And I found even more weird things in my latest test runs... sometimes when turning, you can push full throttle and RPMS goes to max like you were sliding rear wheels... but the strange thing is you have not to countersteer, the rear wheels don't slide despite they are spinning faster than car speed. You still turning and pushing throttle like you were not spinning your wheels, crazy.
I'm more angry the more I use it. See at this bug, in NKPro happened too... new physics engine? and the same bugs than previous title? the car seems like not connected to track, like physics were scripted and not properly simulated, if properly simulated this could not happen in so simple situations:
Edit: I discovered that this bug can be produced by a kind of simulation engine and happens in other sims too (I didn't see it in rF2 yet

), and does not mean a bad simulation, but despite of that there is lots of strange behaviours like wheels spinning faster than ground speed in mid turn phase with no oversteer signs, that is something even more weird.