That is correct.
My pastime since GT5 is fitting cars with different tires and lapping the Nordschleife (or Tsukuba if the a real Ring lap is not available) and comparing with real life lap times to see if that compound is representative of the one in real life.
This could raise a lot of discussion about me comparing myself to professional drivers and stuff, but considering that I can retry lots of times and I can restart if I crash, it is not hard to believe that even my sub-par driving skills can produce similar lap times to real professional ones.
From my experiments, most supercars from late 80's to early 2000's (like Honda NSX, McLaren F1 and Ford GT) would fit CM tires. Only some most modern supercars need CS to match lap times.
Actually, that is not accurate. Have you seen the tires used for the Zonda R Nurburgring record? Almost-not-street-legal-semi-slick tires? Well, I can match that lap on Sports Hard. And I expect that people faster than me, even driving a realistic lap without cutting much the corners, can shave maybe 10 seconds of that time.
Now have you ever seen a supercar come stock with that kind of tire? They don't. They come with comfort tires.
Here is an interesting link about the Huayra and its lap on the Top Gear test track:
http://jalopnik.com/pagani-admits-they-used-two-sets-of-tires-for-top-gear-450547430