Yes, being that turbochargers are so sensitive to air flow and especially loads.
To fully understand turbo lag, you must first understand the operation principles behind what causes a turbo to make boost. Like most forced induction systems, boost is not made by rpm alone. There is a big difference in the airflow through an engine at 6000 rpm in neutral, 6000 rpm in first gear at part throttle, and 6000 rpm in high gear at full throttle. Turbochargers are even more effected by these airflow differences and especially load differences than most other devices. This is why you may be able to see a small amount of boost with a positive displacement supercharger at WOT in neutral but you will most likely not even see zero inches of vacuum at WOT in neutral with a turbocharger.