Who gives a shit where they hit full boost 3200rpm, 3400rpm, 3600rpm, 3800rpm??
Surely it is what the engine does with the airflow at any given rpm point that counts. When we are seeing dyno charts with turbos with a decent early ramp up in power, making 180-200rwkw at 4000rpm and capable of 280rwkw +/-20kw we have a fast streetable turbo. Whether it makes 260rwkw or 300rwkw really is just a question of blondes, brunettes (or redheads) on the street.
IMO they are all good shit.