It's about as fast as The Speed of Sound.
In other words, the speed of The Speed of Sound is 1 times 1.03 mach.(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 1.03 mach. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 4.520 mach to 4.710 mach in water, depending on its salinity.
It's about nine-tenths as fast as a Bullet (Handgun).
In other words, 1.03 mach is 0.8890 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 1.120 times that amount.(for .40 Smith & Wesson 135 grain Sierra JHP, VV 3N37 powder, Fed. 100 primer, Remington case) (muzzle velocity)
A 0.40 caliber Smith & Wesson bullet has a muzzle a velocity of 1.160 mach. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.
It's about half as fast as a Jet Fighter.
In other words, 1.03 mach is 0.510 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 2 times that amount.(for Lockheed Martin F-16, a.k.a. Fighting Falcon, a.k.a. Viper) (maximum speed at altitude)
An F-16's maximum speed at altitude is approximately Mach 2. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about two-fifths as fast as a Bullet (Rifle).
In other words, 1.03 mach is 0.3730 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 2.680 times that amount.(5.56 x 45 mm, a.k.a. 5.56 NATO)
A 5.56 x 45 mm cartridge is fired at a velocity of 2.760 mach. As the NATO rifle cartridge, it is used by the military forces of more than thirty-one countries, including use in the M16 series, M4 Carbine, HK-416, and M249 Squad automatic weapons used by the United States armed forces.
It's about three times as fast as a Peregrine Falcon.
In other words, 1.03 mach is 3.160 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 0.3160 times that amount.(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 0.3260 mach when diving. Falcons are sometimes sent to scare smaller birds away from airports to improve air traffic safety and were used in World War II to intercept carrier pigeons used by enemy forces.
It's about three-and-a-half times as fast as The CRH (train).
In other words, the speed of The CRH (train) is 0.290 times 1.03 mach.(a.k.a. Hexie Hao, 和谐号, a.k.a. 和諧號, a.k.a. Héxié Hào, a.k.a. "Harmony")
The CRH-3 train which runs on China's Beijing-Tianjin Intercity Railway are capable of speeds up to 0.290 mach. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.
It's about three-and-a-half times as fast as a Porsche 911.