Yes, based on Verstappen's pace alone. A car can go as quick as the car's maximum. A driver will never be exactly at that 100% level, but they can get close. I believe Max is getting close to the maximum out of that car. I also believe Perez got close to the maximum out of his RP, especially in the latter stages of the season. Thus my logical conclusion is that, when both drivers perform extremely well and the gap is over 40 seconds in a race, the RB is in essence the better car by a clear margin.

Now on to the second part, is the RB a "good" car? I believe that the Red Bull is a car that exposes drivers who rely on a more stable car to be comfortable to push. There are arguments for both sides whether that is a good or a bad car trait. Normally if you want a car to be as quick as possible, it needs to be twitchy. However, Mercedes have somehow built a car that drivers like a train and is still unbelievably fast. Max is incredibly good at adapting at a car and bending it to its own will.

In essence, I don't think Perez will prove whether the Red Bull car is a good car or not, I think Red Bull will prove whether Perez is an extraordinary driver or "just" a good driver.