The veteran was a Dane. The Scandinavian countries lost almost all their military equipment to the Germans so post WW2 they had a mix of Allied and Axis weaponry. I doubt they could have afforded any Sigs at the time he served.
He did say the 1911 he was using at the range was a bit of a rattle trap. Most of the older 1911 pistols were refurbed more than once and worn out again by that time.
Reliable feed was more important than target accuracy. Many accurized 1911 pistols are not very reliable in field conditions.