I don't need to say anything as the video speaks for itself. It sounds absolutely nothing like a 720S. I've heard louder electric cars.
The posted ACC video is more like it. Mental how people accept any old crap that's thrown at them by developers. Enjoy.
I honestly feel embarrassed for you. You have my sympathies that you actually think that sounds anything like a 720S or that you think that sounds good for any car in any game whatsoever.
FYI that is not what a race spec twin turbo V8 engine and race exhaust sounds like.
Are the sounds in PC3 perfect?
We don't know is the honest answer to that as you are judging it based on footage from the Beta version of the title!, I do however find it rather ironic that someone (based on your posting history) who is so heavily invested in the GT series should pick this particular rock to throw. Let be honest the GT series has taken seven full releases (and a number of side releases) to get even close to accurate vehicle sounds and still has the characteristic 'boonk' sound for vehicle contact, The saying about people, rocks and glasshouses springs to mind.
You seem to prioritise audio above any other factor, which is perfectly acceptable, but for others, it's not as important a factor (that should not be read as 'not important'), hell one of my favourite titles this generation, Seb Loeb Rally Evo, has what can only be described as the worst audio design of a racing title this gen, however, I personally am more than happy top give it a pass because of the accuracy of the physics and stage design.
However, if I am honest, you seem to be raising this point more to start an argument than to discuss an issue with a title, certainly, the manner in which you have responded to people would indicate that's the case. If you really do wish to discuss this, I would suggest doing so in a manner that respects the other members of the site, rather than one designed to simply antagonise and get a rise out of people (which you will see is failing).