For USD/HKD, the average spread in pre-COVID market conditions is about five times the average spread in recent market conditions.
In the recent market conditions, the average spread for USD/HKD is highest around Sydney open. This is similar to pre-COVID market conditions.
For USD/HKD, we observe a flattening of the recent spread curve at around 16:00 GMT i.e. London fixing hour, with spread being more equally distributed across London trading hours during this recent period.