I have the i9 MBP - you can see a run through of it here. I'm sure it's not as fast as it could be due to the thermals, however it's still a lot faster than my previous 2017 i7 for some of my work stuff. I will say though that's because it can *run more* - (I.e. it scales sideways) rather than any specific single task performance increase if that makes sense.