So you are comparing the games without useing all the new tech at hand just because it is taxing on your system or because you simply don't like it?
I don't like the bloom on non-DX11 tracks/cars. Plus, cranking the filters to maximum is taxing on resources while not improving visuals that much.
Then what's the point of a comparison showing technical progress?
Why not? I just felt like comparing both, mainly to see track/car/lap differences. Graphics is something I'm not really interest in, though it's nice when good graphics are well implemented with good performance like on e.g. Crysis 2/3, or Assetto Corsa.
The real "WOW" factor for me was how well Spa was built back in 2006. I don't believe they had laser-scanned the track, yet you can see how true to the real laser-scanned track it was. Blimey and SimBin were at their best back then.
How about comparing stuff like AI?
I didn't have the time for that, nor will I have for a few months.
As much as I like GTR2, people look at it trough their rose tinted glasses simply overseeing some very big shortcomings (atleast in my book) and whenever I fire it up I instantly notice that annoying stuff, like AI cheating in the rain, complete fantasy times and AI so incompetent that every race is a matter of luck
The same can be said about any simulator or any game, for that matter. All of them have huge shortcomings, and whenever you bring them up the "fans" will come biting.
Yet I still thing GTR2 is a more complete experience than most simulators on the market today, if not all. Good physics, complete series (cars, tracks), night racing, rain, driving school, good sounds, AI can be refined by a simple patch, still drives great after 11 years, race engineer that talks to you. Sure, as with any game it still has shortcomings, but the up's certainly outweigh the down's for me, something which doesn't happen with rFactor 2.
Anyway, the sim that you are looking for, will never exist nowadays because lisencing costs have raised alot compared to the times of GTR2 and looking at how Simbin went bankrupt after Race 07 and all the expansions, it seems that lisencing all the stuff didn't turn out too well.
I don't think licensing was the problem, but a handful of other reasons, one being the split of the team and huge success Blimey (now Slightly Mad Studios) had developing games such as Need for Speed.
The closest you will get to your dream nowadays is WRC, Codemasters F1 games or Nascar Heat
F1 2017 is near the top on my purchase list, actually

It's a game which is truly immersive in all senses, something which current simulators fails miserably to do at the most fundamental level, which is sad :/
I just wish they could all join forces and give consumers good and complete products, but that's probably not gonna happen any time soon.